I'm pretty sure any of the paints for platic work fairly well for the inside of the tank. Krylon Fusion is known to be good, same with Rust-Oleums paint for platic. I recently mainted the inside of my antique 50 and I will warn you now, do a very careful job of taping before you paint because once it's done you are stuck with it unless you want a ton of work. Also, allow the paint to cure for the full 5-7 days that is recommended on the cans, filling too early can result in leeching and or one foul odor from yuor tank. Fusion paints over silicon just fine as well.. Hope the info helped.