Several days ago I purchased a volitan lionfish. My tank recently finshed cyclying; though the amonia reading is hard to tell. Nitrites are 0, nitrates are between 10 and 20. He was doing okay for about 2 days. Came home and he had no control of his body yet he was breathing. Gills look red on the inside. Checked the amonia and looks like 0 but used Prime just in case. Is there anything else to do?