i am no expert by far, however i think it is just adjusting to your water levels. think about it this way. it was caught ( or however the proscess starts) shipped to a holding place, sold to someone and shipped and then it set in the tank where you bought it from. then it goes to your tank. so it was under alot of stress at diferent times. and i can almost bet that the water levels weren't all the same at each place. its adjusting to your lights the
salinity levels you N0 levels and everything esle. it will be ok. when i bought mine it acted weirded for awhile and to be honest it still acts weird from day to day. there is no consistancie.
thats just the way i look at it. i could be wrong but its how i feel
