Razor blades and lots of patience. I tried some solvent can't remember what is called now but it was specifically for removing silicone sealants for automotive use, but anyway it did make the silicone soft but it did nothing for getting the seams apart so it wasn't all that useful. For the cost of a 10gal aquarium I don't think I would waste my time I replaced the front panel of a 55 gal and decided after I was done it would have been more cost effective to pay the $125 at walmart for a new tank, it took me about 5 hours with a razor blade to cut the seams apart and I lost a fair amount of blood in the process too, didn't need to go to the hospital but it was close had it been a new blade I'm sure I would have had to go.