Like the title says, my blue hippo Tang is always hiding lately. I first got her in April 2015. She was small, but not the tiny quarter size. I did quarantine her, then put her in my at the time 65g tank. She did great in there. Hardly ever hid and was zooming around for food. Even kinda became the boss of the tank. She grew very well. I moved in December and upgraded to a 100g 5ft tank. She loved the new space. Swimming around and eating. I would say she is about 5 inches now. All of a sudden about a month ago, she is hiding in one of two spots in the back behind some rocks. Even if she came out, it was for a few seconds and got easily startled from movement. When she started hiding, no new additions. Only change was moving my ato container to basement, but have since put it back inside stand just in case it was the clear tubing or check valve (all plastic) and was using the same container. I have since added a bag of carbon in sump.
Salinity is 1.0265
Alk 9.2
CA 300
Mg 1280
Temp 78
All other fish are out and about. One spot foxface, two orange clowns, yellow tail damsel, and diamond watchmen goby.
Anyone have any ideas? I hope it's not the tank size. When I do see her, no noticeable spots.
Edit: no noticeable aggression from other fish.
Salinity is 1.0265
Alk 9.2
CA 300
Mg 1280
Temp 78
All other fish are out and about. One spot foxface, two orange clowns, yellow tail damsel, and diamond watchmen goby.
Anyone have any ideas? I hope it's not the tank size. When I do see her, no noticeable spots.
Edit: no noticeable aggression from other fish.