Greetings MASA.. Wonderful place..My first crack at a marine tank(no pun intended), seeking all the advice possible. Thus far iv purchased a TS3 skimmer, Sicce 2.5 return pump, 4ft 270 litre DT. My plan is FOWLR. Iv also got a standard 3ft which im gonna convert into the sump. The DT is on order, will post pics soon as it arrives.. Any suggestions on the sump before i start the build??