Agree the calcium is a little low, but I'm not sure if that's the problem.
When you say you've moved it around, how long did you leave it in one spot before moving it again? Constant moving will tick them off. With that amount of light on your tank, I'd have it on the sand bed.
That calcium number is low it looks like. Any way of moving it up to 420-450. Not that it means much but I thought the 120 gallon tank was a 4 ft tank and the 125 was the 6 ft tank. I have the 125 6 ft tank.