preparing old tank for reef

[NeonFish]

Hi,

I have old 95 SW with internal overflow. looks like it leaks into the main tank. Over night 1/2 gallon of water test leaked into the main display. Sounds like I need to reseal the internal overflow, as I would have expected no water to leave internal overflow. What is the best kind of sealant to use?

thanks,

[garyinco]

If it was me I'd use true aquarium sealant and completely remove the overflow, clean all the surfaces, and start over with it. I don't think you'll like a patch job. I'd have growing concern about the rest of the tank seams too.

Had a situation not unlike yours and thought "It'll be ok and it'd take such a string of unpredicted circumstances...". Yep. Flood doing more damage than I thought possible. Walked away from the hobby for an extended period, stored the equipment in the way for years. Ended up giving it all to a local public aquarium starting up. 1000's of dollars worth of stuff.

Minimizing risks high on my list these days.