Picked up a 40 breeder today that had been used for saltwater so it has a in tank "sump" setup. Always used hob and canister filters, so as far as media, theres not a lot of space but what would yall recommend? Bioballs? Some kind if plants? Any idea is worth a shot right now, tank wil either be a fry growout or may put a breeding pair of firemouths in it.