I would guess it would be fine if it had the snake in it..
If this going to be a saltwater tank, is there anyway to ask the people you get it from if they ever treated the freshwater tank with any kind of copper medications.? copper is very bad for SW and will kill corals, and the meds get absorbed into the sealant on the inside of the tank and you can't get it out unless you reseal it. So i would definatly ask...find out the names of the meds used...If any...and do some research. If the tank was never treated with meds...my guess is its fine..
Just my opinion! HTH
megan