the other day i bought a blue tang from my LFS. the first day he was a little shy but he ate a lot. the next day i turn on my lights and see him sleeping in the corner of my tank watching me but not really moving. he sat there for a while till i put food in. he ate then went straight back to his spot. next day same thing happened but he found a new spot. are tang really heavy sleepers, is it because its still a little guy, stressed out, what can/should i do if anything. thank you.