It's a 10 gal-not sure of the dimensions but it's around 20" long. Maybe 21. I was going to use a kitchen type towel but it's just barely bigger than the tank. I was worried that a seam or something putting uneven pressure in one spot of the tank might cause a crack. So if I do it I guess I'll use one of my good bath towels. eek!konrad05 said:How big is the tank? And sure you can put whatever towel you want if you don't want to ruin the wood of the end table.