GBTA wont attach

I purchased a GBTA yesterday and it hasn't attached to anything yet. I've been reading and reading and haven't really figured out what to do. I place him on rocks with crevices and he'll wedge himself in there for a few minutes. Then he'll puff up and pop out and float away. I've tried turning the powerheads off so the flow wont carry him away. That does nothing. I'm getting worried and any advice would be greatly appreciated. Thanks.
 
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