A few years ago I bought a 72 bow with a corner overflow and two pre-drilled holes on the tank bottom for a great deal off CL
(around $50 w/ stand). I was very new to the hobby and trusted the person that sold it to me, so despite the silicon looking worn out and beat up, I went home, filled it with water, cycled the tank and eventually setup a really nice tank. I had it running for about a year before I moved the fish into a bigger tank and luckily never had a leak. After emptying it I moved the tank into my garage and kind of forgot about it.
My fiance now wants to setup a turtle tank (one or two Texas map turtles, most likely) so I've been tasked with fixing and cleaning that old tank. The cleaning part is simple and I've watched a ton of videos about how to reseal, but I've got questions about the rest.
First - How do I remove the top border around the tank? I've read online to go around it with a knife to break any silicon holding it in place, but this didn't seem to work no matter how many times I tried doing it. I'd rather not break it so that I can reuse it.
Second - Should I plug the holes at the bottom of the tank? I've removed the overflow since it was filthy and beat up, not worth saving. I've never done a turtle tank, so I'm not sure if it would be possible to use these holes for filtration or not.
And finally - If I should plug the holes, what is the best way? I've read to either use bulkheads or glass + silicone. I have some glass that is bigger than the holes that I could use, but I'm not sure if thin glass will hold.
Thanks in advance!