The MH sounds good. You should ditch the PC lights and get a T5 setup. i ran PC lights for years,but its night and day with T5 bulbs. PC are not that great for anemones or corals. you have alot of watts which is great,but they tend to lose there spectrum early on before the bulb shows anything or to the naked eye.
Filtering sounds good.
your other BTA is doing fine?
is your new BTA bleached at all when you bought it. Keep up on your water changes like your doing. if the other nem,clam corals are fine then i would figure water is up to par. have you tried to feed it yet?
If you bought him at the LFS did you wait 15-20 to get him use to temp-floating the bag then adding a small amount of water and so on.
If you got him shipped to you longer then overnight you should have adjusted him alot longer. let us know!