I want to be able to grow sponge for my angelfish. Could I do it in a tank I grow macro algae. It's very nutrient rich water, it's my molly breeding tank. Macro algae grows well in the tank with no doesing. The mollies keep it prestienly clean of unwanted algae and only nip here and there on the macro. They clean the macro algae but don't often beat any of it. The macro loves the tank, grows fast. The tank has medium lighting moderate flow.