I will never purchase anything from RS again. I bought a used tank (much like yourself) albeit a 170.
Hi, just noticed the silicone from my RS-170 has a pinhole leak on the back pane. The tank is level, and I patched it with Tunze Coral Gum (no silicone available for immediate patch). I was able to stem the tide from a steady stream to a small 1/10 ml drip per minute. I need solutions fast...
www.reef2reef.com
I had to find a replacement RS-250 that I bought at full cost at the time. The glass is cheap, the silicone is not the best work, and you pay a premium for all of it. If I ever get another tank, I want to find a reputable builder and spend the money. Or go the alternate route and buy a cheapo all-glass.
-Tom