Recently purchased a 5in gulper catfish from online via Petzone. I’ve had it for a week now. Didn’t come out of his/her hide for a day upon arrival which is understandable. I have 2 platys in gulper tank for feeding and he/she won’t touch them. Also tried frozen thawed shrimp and Talpia fillets and zero results. Recently did a 30% water change and vacuum, tap water was treated with Prime and stress coat plus. Ever since the water change my gulper has been acting different such as glass surfing in the corners of tank, even sitting vertical against glass and hang on back filter for long periods of time. swimming around Wavemaker for hours then back to glass surfing. Hasn’t went in hide for 3days now just constant swimming repatitive glass surfing and circles around Wavemaker. Just looking for some feedback or anything to help me understand this behavior. My tank is cycled 7.0 PH ,0ppm ammonia , 0ppm nitrites, 5.0ppm nitrates