I've had this flasher wrasse in QT for 4 days now. I haven't added anything for treatment. Ammonia is at 0. He's got a white protruding "crown" on his head that I didn't notice when I placed him in. Any ideas as to what this is? He had a pretty stressful transit, got caught in weather and was stuck for an extra 24 hours for delivery (almost 48 hours total). He's been eating well since I placed him in, but has been "laying" on the ground and inside the PVC pipes. Any ideas as to what this might be?