Wait, and eventually they will host. Or not. They may decide that your frogspawn, or your GSP or your heater are preferable hosts. Nothing you can do about it.
If they do, though... that's a happy day, and a real thrill to see. Shortly after that, you can expect to be attacked and bitten every time you put your hand in the tank, as they defend their host. Nasty little buggers (or at least mine are). Cute though.
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