Do you have other fish in there with your armatus? It would help if you had some dithers in there with him. Your armatus would see the dithers eating the market prawns and copy them. You also need patience.
All solid advice from everyone. When I had my armatus back in the day I would only feed him live. My armatus was part of the very first shipment of confirmed armatus brought in. My armatus’ name was Raider. He was owned by 3 people here on MFK. I was the 2nd owner. Dovii Kid May remember.
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I will attach some old pics of Raider that I dug up from my old profile. Been a long time since I’ve been on MFK.