Hey all,
I'm olive oil all the way!! I used to use Vaseline, but when you want to use the tank for something else you cant ever get it clean! Then someone told me to use olive oil, and its super, works great on both my lobsters and hissers. I reapply it every few weeks, just to be safe, but they NEVER get out! I used to have a few get past the Vaseline, but not with the oil!
Just my 2 cents but its the best out there, and when it dries your tank is good as new!
~Samuel