[saf1]

There are no holes on the side of the tank. Just the weir for the overflow - Outer holes, used for returns, are 1". Three inner holes are 1.5". I don't remember what the thickness of the overflow glass is but it is thinner than the overall tanks. The tank is 54" Wide x 30" Tall x 30" Deep.

Return 1" pipe in the picture above is just stubbed. Since then I've run one over the back of the tank along the Euro brace and plumbed in two 1" Sea Swirls. The return that is at the front of the tank is just turned off below and capped. I'll be adding another pair of Sea Swirls at a later date. It isn't needed at the moment since the tank is cycling.