Hi Bob,
Sorry, I can't give any advice. I'm very very new to it as well. But I did want to give you the web site some of these guys have put together that's very helpful. Just don't know when they'll be online with Father's day and all and thought this would give you something to read.
I do know that when they respond. They'll want to know what particular type of Horned Lizard you own. That makes a difference. If you don't know but have access to a digital camera and can take pictures they can tell you from that.
I'm pretty amazed at the knowledge these guys have. just looking back and reading their posts will help you a lot.
Good Luck and Happy Father's Day!!!!
http://www.Phrynosoma.com (Not sure who, but a couple of the guys on this site put that web site together. Lots of info on it) Get ready to hear . . . ANTS, ANTS, ANTS!!!!!!!