Hi guys no offense taken,the tank is a 1000x700x500! The chambers are 300x700x500.. I have been running for quite a while now and no probs,Infact the tangs are much happier in there chambers then in the main tank! The only reason I sectioned it of was because I had some predators in before,had a lion fish and a clown trigger! Will post pics of the sump later... Also there is 1 tang per chamber,only fish that gets in are the smaller ones but they move to wherever they feel comfortable.