Wandering BTA disappeared
I have three BTA's in my tank. One which had split. When I first introduced my BTA's they wandered until they found a place that suited them. One had disappeared for weeks while the other one only moved to a better spot further down the outside of the rocks. Yours will eventually reappear and settle down. However, remember that the longer he is hidden, the smaller he will become, so you will have to be prepared for this. When mine reappeared he was about one third his original size.
As for food, I feed mine krill which they eagerly accept and on occasion scallops. I have never tried mysis, but do know from trying other types of food that they will wander until they find the right current, food and lighting combination. If yours shinks too much, I used krill based pellets soaked in vitamins and some liquid inver food which I fed using a bulb type dispenser from one of my test kits. I did this until he grew large enough to accept chopped krill pieces. An eye dropper would probably work here too.
Hope this helps and good luck.
Larry
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