are you intending to keeping the fry? keeping in mind that batches of over 100 arnt uncommon and thats a lot of extra waste. im not trying to be rude but every breeder i have delt with runs at least some kind of filtration, even if its just a HOB. its just about doing the best you can for your pets. belive me i love the whole biospher thing but fish are generally a little to complicated to do well in one.