aquarium repair

So, a little back story on this. I have a 160g I'm trying to reseal. My first attempt on this didn't go well. I'm finding it very difficult to apply sealant and pull tape off before the sealant itself starts skinning over. Needless to say, I'm having to start all over on this. It's very...

So I am reusing some old aquariums, one of wich is for my alligator snapping turtle. The aquarium is not full, beceause of this the old silicone line for a divider is visible. Does any body have any suggestions to remove this, i have used vinegar and razorblade so far (not with the turtle in it).

I bought this tank a few weeks ago and have it up and running as a reef tank w/fish and inverts. It didn't cross my mind to repair it prior to filling because I was in a hurry to get the live stock back into the tank (purchased all together from a private seller). However, now it's starting to...