Thanks, next time I use aspen I'll use only a little bit. Another question. I'm having a really hard time regulating temperatures, and it just accidentally got up to 100, but my bp moved to the middle of the tank (yay, s/he has common sense). The cool side of the tank is all the way down to 69 though. Should I have two heat pads and light dimmers to try and keep the proper temps? It's really frustrating.