I just picked up two small terracotta pots for Sookie and Gandalf. 1 for each tank. My question would be, what is the proper way to go about sanitizing these? Also, the holes in the bottom are just a wee bit large for my comfort, but not large enough for them to swim through. I have some aquarium safe mesh and some aquarium sealant. Would it be alright to seal the hole with the mesh? The bottle on the aquarium sealant says to let it dry for 48 hours. Does anyone have experience with this? Is 48 hours correct?