In reply to Tarqs:
I got a kit for a ex and we had months of fun with them,, Until she decided to add a goldfish, and hey presto no more Triops and a fat goldfish. they'll cope with any sorta fishy food but loved bloodworms lots..
I dont think they'll need to be as warm as your vivarium will be keeping them but Its Tv for your Gecko.
My snake would love a big pond in his tank and would endeavor to break in and eat whetever it was as soon as he could. Your Gecko must be happy and well fed
Uri