thanks for the information, is there any certain models you have worked with or would reccomend for the sand filter and biotower, also what would be your opinion on housing a smoothhound with bamboo sharks at a temp in the low 70s, is it even possible, i dont want to stress either species so if it's not possible i will jsut forget the smoothhound, its just i realy like their size and activity level of that shark. if there is another species that is similar thats more tropical and is suitable for my tank dimensions please let me know.