Quick "structural" question on tanks. I noticed last night the bottom frame on one of my tanks has cracked. How concerned should I be? I'm assuming that the frames do actually play a role in holding the panes together?
depends on the tank size to say how needed it is the bigger the tank the more important the rims. Smaller tanks usually have them for aesthetics and they don't do much more for bracing the tank beyond what the silicon already does
Look for Petco's next $1 per gallon tank sale. A replacement would be $20 plus tax. Old tanks can last a lot longer, but I wouldn't trust that one any place where I couldn't accept a 10 gallon+ water spill. My guess is the plastic rim just got brittle, but it could be more serious.
Craigslist would be a good place to dispose of the tank, as a snake home, or a low water tank. Then keep looking there and you might find a nearly new same size tank for almost free, or one including a stand, light, filter, etc. all for $20.