Im having problems with my 6" SAL and my aqua clear 500s, theyre to powerful, he cant sit still on the bottom, hes always being blown around. I have the problem fixed temporarly but i need a more long term solution. I have an old 55g that im not usuing, i know it wont hold him for life or anything, but i need to know what i can use for a filter. At this point im about ready to buy an air pump and sponge filters but i figured id see if any one has any better suggestions.