hi,i started out with two but ended up with only one,a male and he is a happy little guy,he is all alone but seems to care less,i have read on this forum that chams are solitary creatures and there seems to be no difference in the species,so based on my experience and my happy little guy,i say one would be just fine..if its a female make sure you have proper substrate for her in case her species lays eggs regardless of a male contact and in case she is gravid when you purchased her(if its a fem)or she may die from being egg bound..good luck and have an awesome day