So today my boyfriend gave me an old 10 gallon that was in his grandparent's garage. I'm not sure if it's glass or plastic. I'm assuming it's glass though. On one of the panels there is a hole and a bit of a crack. The hole is about an inch long and a half inch high with a crack a little bit longer. It is in a bottom corner. I'd like to divide it and put 2 of my males in it. But I was wondering if the hole can be fixed safely with silicon or if the panel has to be replaced. I researched it a little bit already, but all I could find was about how to replace the panel itself.
I'd rather just fix the hole, but I wanted to get opinions before I did anything. Although I'm expecting to have to replace the panel.