I resently purchased a niger trigger. After I took it out of the QT tank and placed it in my tank it imediately went into the rocks. The other fish in the tank began circling around the tank as if trapping him in the display. They would not let him out or so I thought. This morning I rearranged the rocks. The trigger just moved under another rock and the other fish are now swimming normally. Do Triggers usually hide? He had been pretty active at the store. There wasn't anything for him to hide under in the QT.
Jeanett
Jeanett