I recently purchased a Bristletail Filefish for my SW
aquarium. He seemed to be doing fine after adding him to the tank (yesterday), but today he has been behaving strangely, hiding near my filter intake sideways. I fed the tank a frozen food cocktail (shrimp, etc), and he ate, but now as I've said, he's swimming sideways. So far as I know, this isn't normal.
Anyone help? My water parameters seem fine, and the only other inhabitants (Flame Hawkfish and False Perc + Rose Bulb Anenome) are all thriving.