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[Dale]

Yes, there is a 1/4" or so gap caused by the top and bottom black plastic molding on the tank. I first filled the gap with weatherstripping and then silicone after that.

Here's the display tank. A 135G. I bought used for $50. It needed a good cleaning and resiliconing. Dig that 'ol school' corner overflow box!



Here's the sump. It's a 50G. breeder that was cracked on one end. I picked it, and two other tanks, up for power raking a freinds lawn.



and here's a link to a thread that describes how I resiliconed it: http://www.aquahobby.com/board/viewtopic.php?t=35335

and here's the happy couple.



Here's one of two corner overflows



and a top view