Bio setups are a PITA if you ask me. Any number of things can go wrong and it's usually a battle to keep things in balance, then you end up throwing everything out anyway when it doesn't work out. People will tout that it's virtually maintenance free, but if you ask me it's a maintenance nightmare of odors, bugs, fungi, etc.. Even if does work, (which is a balancing act not unlike trying to balance a pin upright on the head of another pin) it's still a PITA and not worth the hassle. Just my opinion.