Hello. I'm in Australia and have had an AP system running for over a year. It is a converted 55000ltr swiming pool with 6000ltrs ish of gb volume. I also run ABF's(airlift bio filters) and have a 1000ltr+ swirl filter. Fish load is around the 500+ mark ranging in sizes up to 35cm+. Mainly silver perch and eel tail catfish. A few goldies and one lazy cod. Couple of hundred mussels in there as well.