we keep a 210g show tank reef & fish the basement has 3 50 g deep sand beds w/mangrove and seahorses and a 40g chaeto tank where we keep our feeder shrimp and treat our nitrates and phos we use 2 large skimmers w/ozone and 3 huge uv s total sump is aroud 400 g we are new at this and learn a lot from on line and macna and literature