Thank you very much for your reply, Oliver! I will re-read the Aquaponics 101 several times probably until I actually move to doing something in reality other than planning. So far I'm still trying to understand how it all works! Bioponics sounds exciting, if possible to maintain an organic system for the plants without fish, that would be my preference (I do not eat fish and do not want to breed fish, will do it only for the aquaponics model).