Essential food for optimal growth up to 12 cm Complete nutrition for all Koi floating, particularly stable-shaped  granules perfect for  small Koi promotes balanced  growth , a robust  immune system  and ideal  development highly digestible due to the balanced  ratio of carbohydrates and proteins ideal for  year-round complete feeding Koi Royal Mini is a foundational feed crafted from carefully produced granules free from artificial colors and preservatives. High-quality ingredients like omega fatty acids and immune-boosting Mannan-oligosaccharide promote healthy growth and resistance to diseases. The inclusion of 4% insect meal sourced from sustainable farms enhances the carefully chosen components. With its optimal balance of carbohydrates and proteins, this feed is easily digestible and suitable for high-quality feeding throughout the year. The dietary needs of Koi are perfectly met. The floating granules maintain their shape well and do not contaminate the water. Ingredients Fish meal, corn starch, wheat flour, wheat gluten, insect meal ( Hermetia illucens ) (4%), fish oil, brewer's yeast, Mannan-oligosaccharide (0.7%), green-lipped mussel meat meal, garlic, Haematococcus algae . Additives Vitamins and provitamins:  3a672a/vit. And 14,400 IU/kg, 3a671/vit. D 3  1,800 IU/kg, 3a700/vit. E 180 mg/kg, 3a820/vit. B 1  18 mg/kg, 3a825i/Vit. B 2  18 mg/kg, 3a312/stab. vitamin C 180 mg/kg. Analytical Constituents protein 36.0%, fat 9.0%, fiber 2.5%, moisture 6.0%, ash 7.0%. Feeding Instructions Feed 1-2 times daily throughout the year, offering only as much as the fish can consume in a short period.  

sera LED extension cable 1 unit. 1.2 m (3.9 ft.) 31290

Acrylic glass holder designed for stylishly securing the sera LED X-Change Tubes on open aquariums Featuring transparent locking screws, this sleek acrylic glass holder, shaped with elegance, can be customized to fit any glass thickness (up to 13 mm/0.5 in.). It seamlessly integrates into your aquarium's overall aesthetic, ensuring the focus remains on the beauty of the aquarium itself. sera LED Tube Holder Clear: 2 pcs.

Cool bluish daylight for both freshwater and marine aquariums (10,000 - 12,000 Kelvin) Boosts bluish hues Can be dimmed using the sera LED Digital Dimmer High light intensity The sera LED X-Change Tube cool daylight delivers the perfect illumination for freshwater and marine aquariums. In freshwater setups featuring bluish fish like lake Malawi cichlids, neon tetras, or rainbow fish, the bluish glow from the LED tube enhances their colors, showcasing the vibrant hues of the fish beautifully. This bluish daylight creates a deep-water ambiance in marine tanks, mimicking the natural light found in the ocean. Additionally, it amplifies the fluorescence of corals, making them stand out. The sera LED Digital Dimmer allows you to modify the brightness or light intensity of the sera LED X-Change Tube cool daylight, enabling it to function as moonlight or nighttime lighting as well. This product does not qualify as a light source according to EU commission regulation 2019/2015.

Authentic colors and natural daylight (6,000 - 8,000 Kelvin) Enables the simulation of sunrise and sunset when paired with the sera LED Digital Dimmer Ideal for freshwater aquariums The sera LED X-Change Tube daylight sunrise produces authentic colors and natural daylight. This tropical light, boasting a Color Rendering Index of approximately 90, mimics natural sunlight, making it perfect as LED illumination for all freshwater aquariums. The vibrant LEDs effectively illuminate the aquarium while preserving the true colors of the environment. Using the sera LED Digital Dimmer in conjunction allows for adjustments in brightness and light intensity of the sera LED X-Change Tube daylight sunrise. Additionally, it can simulate both sunrise and sunset at customizable times to suit your needs.  

True-color and natural daylight (6,000 - 8,000 Kelvin) Enables the simulation of sunrise and sunset when paired with the sera LED Digital Dimmer Ideal for freshwater aquariums The sera LED X-Change Tube daylight sunrise produces genuine colors and natural daylight. This tropical light boasts a Color Rendering Index of about 90, mimicking natural sunlight, making it perfect as LED illumination for any freshwater aquarium. The bright LEDs provide optimal lighting for the aquarium while preserving the true colors of the fish and plants. When used with the sera LED Digital Dimmer, you can easily modify the brightness or intensity of the sera LED X-Change Tube daylight sunrise. It also allows you to replicate sunrise and sunset at specific, customizable times.  

The bluish glow of the cliff Approximately 18,000 – 22,000 Kelvin, varying with the dimmer adjustment Amplifies the fluorescent appearance in marine aquariums Ideal as supplementary lighting in Malawi aquariums or as a moonlit effect Facilitates the simulation of dawn and dusk using the sera LED Digital Dimmer Compatible with both freshwater and marine aquariums Blue actinic light is perfect for promoting algal endosymbiosis in both soft and hard corals, as well as other invertebrates. The emitted blue LED spectrum is broadened by utilizing two distinct LEDs, ensuring the correct wavelengths necessary for photosynthesis. This light is also effective for enhancing color vibrancy and depth when used as supplementary lighting in a Malawi aquarium or as moonlight. The ideal pairing is with the LED X-Change Tube neutral brilliant white or LED X-Change Tube daylight sunrise. When used with the sera LED Digital Dimmer, the brightness of the sera LED X-Change Tube marine blue sunrise can be adjusted. Moreover, the simulation of sunrise and sunset can be tailored to specific times set by the user.

Color-enhancing plant light designed for optimal growth of your plants (2,450 Kelvin) Facilitates photosynthesis Enables the simulation of sunrise and sunset when paired with the sera LED Digital Dimmer Ideal for freshwater aquariums Proper lighting is crucial, especially in aquariums filled with aquatic plants, such as aquascapes or Dutch-style setups. Plants will thrive beautifully and uniformly only when they receive the right amount of light. The sera LED X-Change Tube plantcolor sunrise has been specifically created to illuminate plants and promote photosynthesis. This leads to healthy growth and increased reproduction of submerged plants. The incorporation of red and blue light wavelengths enhances the vibrant colors of the plants, giving them a more vivid appearance. By using the sera LED Digital Dimmer in conjunction, you can adjust the brightness or intensity of the sera LED X-Change Tube plantcolor sunrise. It also allows for the simulation of sunrise and sunset at custom programmable intervals. This product does not qualify as a light source under EU commission regulation 2019/2015. LED X-Change Tubes ↔ T8 / T5

Designed to assess the magnesium concentration in a marine aquarium reagent 3 spare cartridge Caution! Reagent 1 contains sodium hydroxide, which can cause serious burns. Keep this reagent securely stored and out of children's reach. Always wear protective gloves during use. If it comes into contact with your eyes, rinse immediately with water and seek medical advice. If you experience any nausea, please consult a doctor and bring this manual with you. A balanced magnesium concentration is essential for the health of marine invertebrates and algae. A prime example of this is red calcareous algae, which require significant amounts of magnesium to form their skeletons. Natural seawater typically has around 1300 mg/l. To create optimal conditions in your marine aquarium, this concentration should be maintained. You can quickly and easily determine the magnesium levels in your marine aquarium using the Sera magnesium test. For those looking to boost magnesium levels, Sera magnesium plus provides a convenient solution. You can enhance the magnesium concentration with Sera Marin COMPONENT 6 magnesium. The amount of reagent used will depend on the calcium levels of the water being tested. Store in a cool and dark environment! Usage Instructions: To maintain a healthy environment for invertebrates and ornamental algae in a marine aquarium, it's crucial to have an optimal magnesium level. Calcareous red algae exemplify this, as they require substantial magnesium for their skeletal structure. Natural marine water contains approximately 1,300 mg/l, which should also be upheld in a well-managed marine aquarium. The Sera magnesium test enables you to efficiently monitor the magnesium concentration in your aquarium. If you have prior experience with the Sera calcium test, this will make the process even simpler. You can effectively raise the magnesium levels in your marine aquarium by adding Sera Marin COMPONENT 6 magnesium. Instructions for use: Shake the reagent bottles thoroughly before use! Avoid allowing the tested water to come into contact with aquarium or pond water!  1. Rinse the measurement vial several times with the water you intend to test, then empty it. Wipe the outside of the vial dry.  2. Rinse the syringe several times with the water to be tested, then draw 2 ml into the vial using the syringe. 3. Add 6 drops of reagent 1 and shake the vial until the liquid is uniformly mixed. Any cloudiness that forms will not impact the test results. 4. Introduce one level measurement spoon (included in the kit) of reagent 2 into the vial and gently swirl the vial (do not shake) until the powder is completely dissolved. 5. Add reagent 3 drop by drop while counting the drops, releasing pressure on the reagent bottle after every 5 drops to allow air to enter. Shake the vial after each drop until the color changes from pink to blue (not violet) and remains stable for at least 30 seconds while occasionally swirling the vial. Take note of the total number of drops used. 6. Empty the measurement vial, rinse it thoroughly with tap water, and then rinse it several times with the water to be tested before emptying it again. Dry the vial's exterior. 7. Fill the syringe with 2 ml of the water to be tested and transfer it into the vial.  8. Add 6 drops of reagent 4 and shake the vial until the liquid is evenly mixed. Any cloudiness that appears will not affect the test.  9. Add one level measurement spoon (included in the kit) of reagent 5 into the vial and gently swirl the vial (do not shake) until the powder is fully dissolved. 10. Introduce reagent 3 drop by drop while counting the drops, releasing pressure on the reagent bottle after every 5 drops to allow air to enter. Shake the vial after each drop until the color shifts from red to green and remains stable for at least 30 seconds while gently swirling the vial. Note – you will require significantly more drops for this measurement than in the first measurement! 11. To determine the magnesium level, subtract the number of drops used in the first measurement from the second measurement. Multiply the remaining number of drops by 60 to convert to mg/l. For example: if the first measurement used 4 drops and the second used 24 drops, subtracting gives you 20 drops. Multiplying 20 drops by 60 results in 1,200 mg/l of magnesium. 12. Cleaning: Rinse the vial and syringe thoroughly with tap water before and after each test. Immediately close reagent bottles after use and do not interchange caps. Store at room temperature and away from light. For use in ornamental fish aquariums and pond water only. Store in a cool and dark environment!

Provides essential calcium for the formation of skeletons in corals and other invertebrates; use alongside Sera marin COMPONENT 2 Sera marin COMPONENT 1 Ca - calcium - designed for saltwater environments. The Sera marin COMPONENT 1 - 7 series is crafted for advanced marine aquarists, delivering seven vital components that work harmoniously to nourish corals and other invertebrates. Sera marin COMPONENT 1 Ca is rich in crucial calcium required for constructing the skeletons of corals and other lower life forms. The recommended calcium concentration in water should range from 400-450 mg per liter. You can easily check the calcium levels using the sera Ca-test. When used together, sera marin COMPONENT 1 and 2 help achieve the ideal pH level of seawater, thereby maintaining the natural balance in your coral aquarium. Dosage: Utilize the cap as a measuring tool. Add one capful of sera marin COMPONENT 1 and 2 for every 100 liters of seawater, allowing a gap of 2 to 3 minutes between additions. It's important to ensure that the calcium level does not rise by more than 20 mg/l in a single day.