Thanks! It's a bit longer (4 inches) than a 10 gallon and quite a bit taller as well as deeper, so I guess i'll be better of not using a 10 as a substitute for a 20H. I was about to ask that since you used cork rounds, wouldn't GS fill up the pots from the bottom. What do you use to carve it? I can see having a hard time getting a knife in a pot to carve dense foam. Sorry for all the questions Don.