First time so please excuse me. I have a 72 gallon bow front aquarium. in it there is 2 bottom cats, just one electric yellow cichlid(I started with 6 but to my only thinking which I was not only one is left there were several colors) anyway the cichlid is full grown but very very shy I am planning on putting more in but only smaller and about 6 to 8 of them. I also have a sucker fish and he is huge when he hangs on the front glass he takes up almost all of it. So this is the real question I want to put sand in the aquarium and I wanted to know if it would harm any of my fish?
