You guys are kidding right? A cowfish won't even be able to see newly hatched brine shrimp, let alone chase it down to eat it. I think the original poster was referring to frozen adult sized brine shrimp or mysis. Cows need meaty foods along with nori for fibre.
The only thing that comes to mind is to try some freeze dried blood worms. See if he'll accept it first before buying an autofeeder. You don't want to come home to 8 days of uneaten food laying at the bottom of the tank. Good luck!
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George
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