display tank, maximum size you're comfortable with

[Megs]

were running an inverted 135g display (6'X2'X1.5') with a 75g sump, space and weight on second floor of house were the reasons we went with this size, we went inverted because 2' deep gave plenty of room to aquascape and 1.5' tall is relatively easy to light (though with 18 HOT5's 2' would be no problem, so if it werent for the 2nd floor thing a 180 would have been great).

i probably wouldnt want anything bigger than around 300 gallons, for maintinence cost/work.