I Have had This BTA for about 5 Years. i recently upgraded my tank to a 60 gallon from a 30 gallon. with new A160 kessil lighting. the BTA has been moving around ever since the new tank has been set up and seem to not find a spot he likes. he is in the back of the tank under and rock near the sandbed and is in a ball. he keeps moving around? is he just trying to adjust to the high power lights?