10w fish tank submersible pump filtration box, how to modify, make it more effective?

Seeing that your filter box is deeper, you can put 1-2 layers of ceramic rings at the bottom, which work together with the biochemical cotton to cultivate nitrifying bacteria, and you can put a stocking on the biochemical cotton to improve the filtration effect. If there is still space in the filter box, you can add another layer of filter cotton. Raise fish first raise water, water quality is good, fish can be raised in good condition. And fish should be diligent, to often clean the filter cotton, so as not to damage the water quality or cause clogging, and then the good filter is not as good as their own hands to clean off the water fish poop and other garbage.