Black Neopreme is best for the tank. Just use 5/32 brass and it's almost impossible to get off (ask me how I know..do it right the first time or get ready to tug). I use a brass nipple in the middle to keep it from folding back and getting stuck at the front of the tank. Use little bread wrapper twisties with the plastic/paper stripped off to hold it on.

http://www2.towerhobbies.com/cgi-bin...&I=LXK824&P=ML