I am a reptile breeder converted fresh/marine aquarium addict/professional, so I know what some of those herps can do the seams of a tank. I think that you have to weigh the potential risk, then decide. I have aquired many abused tanks so if I am not sure if they hold water they get setup in my basement with concrete floor and drain. On my hardwood floors upstairs...risky? What if the tank has a slow leak? Will you have a place to transfer the inhabitants safely so repairs can be made? I have also patched questionable seams without redoing the whole tank. IMHO that seam doesn't apear too bad, make sure the tank is leveled b4 filling and be able to watch for slow leaks.