best way to seal up a sump hole

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Well depending on the size of the whole there are a couple different things that can be done. The first is if the hole is the same size, you could take a plastic cap from a UGF place it in the hole then put some sealent on the inside and outside of it. You could always try the glass on the inside and outside but it will look pretty tacky. Also check out your LFS sometimes they sell plugs just for this purpose. Just a couple ideas for you to try.
 
put a bulkhead fitting in it with a plug. then if you ever want the hole it is still useable. all of my planted tanks hove holes for a overflow drain.
 
Put a plug in the bulkhead fitting to seal it up, then you can fill it all the way up. the bulkhead fittings use standard pipe thread inside and you can get a plastic plug, use a little silicone plumbers grease to seal the threads.
 
bpimm you hit the nail on the head. This is what I was thinking but could not remember the correct terms for some reason. Thank you for posting the info.
 
This is what you need.

I got home today and this was sitting next to my computer, I figured it wanted it's picture taken. :)

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