Hi! I have six Pangasius (iridescent sharks) in a 4-foot diameter, 2-foot deep rubber pond (a modified old tractor tire) and I want to transfer them to a 6'X2'x2' glass tank so I can view them properly. The oldest cat is around 2 years old at 18" while the youngest is 8 mos. at 9". What material can I use to pad the tank ends so my skittish cats won't bust their noses raw? Thanks!:dance2: