Ok, so it still really just comes down to tricking the male to eat frozen food.
While I *have* moved the anenome just to be sure, I don't think y'all are listening to me. He IS eating live brine. He IS active. He's not bullied, not scared, nothing. The ammonia's almost 0, the nitrites are almost 0, the nitrates are hella low. The temp is 78-79, and the PH is a stable 8.2.
He's just not eating frozen foods. I've even gone out and spent $10 on garlic extract, didn't work...
Is there a way to trick fish into eating frozen? I don't think this is a seahorse-specific issue, though of course I've been known to be wrong before.