Fish in a critter tank ?

I have a 95 gal critter tank with a stand.It once was home to an iguana.It isnt a sliding gl tank,it is a solid side. If i reinforce the stand and reseal the tank will it be safe to hold water? Are critter tanks gl tempered different? One pet store told me that the tanks are constructed the same except the critter tanks arent guarenteed to hold water.. another store told me the gl is thinner and weaker...anyone with info plz help...also im not rich or else id of just bought a new one.