Replace one side of a tank?

[WindowMaker]

there is a sticker that says "tempered on all sides do not drill" apparently this is super common with 55's. I have some marineland branded aquarium silicone, but I will check for the other brand at HD to see if they have it. I think everything in there is black right now. I hope to turn this tank into a seahorse tank for the wife. She is obsessed with them.