Try to find Terrance on here and pick his brain on here, he is a genius with puffers. I am looking into them also for a future tank of mine in the planning. I have also been looking thru this site for some more info on them dwarfpuffers.com ....but first hand experience is the way to go with info about these guys and Terrance is the one to go to with these from all I've read that he's posted