Yea I think it might have been you who recommended them but idk. Either way he was great to deal with and the best looking BB I've seen yet.
I keep paper towels too for both my leos and my BB. I had the paper towels in the leo tank for a a week at the longest so far and no mold has grow on it. I was going to see how long it would take to grow but I don't want to push it. I would say 2 weeks at the max. Also my leo tank is only at 30% humidity at all times so with a BRB or a BB and the humidiy being in the 70's normally it may cause it to grow faster. But I am going to change mine every 1-2 feeding and spray it daily.