leak in sump

[Lampshade]

I've done the same thing with patching a leak. generally if it's leaking in one spot, others will quickly follow. I thought that resealing a whole tank would be a pain, but it was surprisingly easy. I probably spent more time screwing around with the leak than i did resealing the tank.

[Aquattro]

I resealed my 75g sump in about an hour. Also, if you're just doing the corners to seal, strength isn't really an issue, so any (pure) silicone will work fine. The GE 1200 is stronger and recommended for assembling the glass.