I have had monitors for years, these are my newest, but as far as them being healthy, they are great. My humidity stays good, my heat stays good, everything is fine. I did not say it is easy to keep them in fish tanks, it does take a little extra work to do, but I have done it very successfully. They do get whole prey items, but I also give hard boiled eggs or cooked liver with them. My monitors have lived past their first and second years now, that in its self, is more than most people can say, even with taking adequate care of them.