Just some general question. Right now as a substrate I'm using paper towels. To clean I use chlorhexidine. I use two table spoons per 24 oz of water. Have you guys noticed how it changes color. Is that normal? Does it have a shelf life once mixed with the water? I noticed the first day it was blue then yellow and now back to blue. Also with paper towels if the snakes urniates the whole towel gets covered I check on My snakes daily. So they might be wondering around their piss for about a day. Is that ok? I've thought about switching to aspen in order for them not to roam on their pisss but I'm afraid of some of the horror stories I've heard from aspen. Any suggestions?