Can I put filter rings and biochemical cotton instead of filter cotton in the aquarium?

If the density of fish is low, and it can be exposed to biochemical energy by sunlight, you can only put filter rings and biochemical cotton.

But if the density is high and there is no sunshine, because biochemical cotton is not easy to clean, it is best to put filter cotton on top and biochemical cotton on the bottom, so the biochemical effect will be better.

Here are the filter cotton and biochemical cotton:

Filter cotton. The scope of cotton filtration is relatively wide, and the cotton filtration (screen) usually refers to air filtration. According to different materials, filter materials are divided into four types: synthetic fiber filter cotton, non-woven filter cotton, glass fiber filter cotton and activated carbon filter cotton. According to the different filtration efficiency, filter cotton can also be divided into primary filter cotton and intermediate filter cotton.

Biochemical cotton. It is a widely used filtration material, which mainly plays the role of biochemical filtration. Suitable for decorative aquariums, such as seawater tanks, fresh water tanks and aquatic plants tanks. It is mainly used to cultivate nitrifying bacteria, which can decompose toxic NH3/NH4 and NO2 in water and transform them into nontoxic NO3. Therefore, it can improve the water quality and improve the survival rate of fish, and it is a filtering material with both physical and biochemical filtering effects. Good elasticity, large surface area, not easy to be damaged, and can effectively filter impurities in water.