get some tongs for cooking and throw that thing on the barby But seriously tongs should work just hold them tight so he doesn't bite ya. Put it in a box he cant get out and kick the deadbeat out of your house.
Nope, it wont harm your plants in anyway.. Actually it'll probably eat any insects that happen to fly in there.. and it should love the warmth of your grow lights. EDIT: oh noes!!! Aparently there are a few lizards that like eating plants. Did the lizard that ran into your growbox look like either of these? Uromastyx: and Iguana:
lol, uromastyx or iguana? Uros only live in africa man unless its an escaped pet... this rocks, Id just keep it and start a little self contained ecosystem that produces marijuana.