My Long Tentical Anemone and Some Questions

[amastine]

My local fish store had its bi annual sale last weekend. Ao i got my clownfish a lta, since the flame angel had taken over their rock that they slept in. I also bought the led lighting system for the lta. the ones with the blue and white lights with dimmers. I placed him in the tank and he found a location he loved immediatly. he has only moved a little. he placed himself under a shelfrock originally in the sand, the moved his foot upside down on the actual shelf rock, now i thing hes moving back into the sand.
Here are my questions, how do i know if my lta is not doing well. he looks pretty happy to me. Also i had 2 cleaner shrimp. one died, adn the other went missing overnight, they were added the day after my lta was. the one that died, im not sure it was b/c of stress or w/e and the other went completly missing. that night when b4 i went to bed the shrimp were on the rock right next to the lta. the one that went missing we have found no remnants of its body or anything could the lta have eaten it. Also i cant seem to find food he likes, i bough mysis shrimp for him, and also some silversides. But when i give them to him he "tosses" them aside. Also the clownfish wont go anywhere near the lta but my 2 domino damsles have taken to hosting in it. also my sally lightfoot crab guards it its kinda odd lol. he'll stay upside down on the bottom of the shelf rock circling hte outside of the tenticles, but never actually going over them. i just want to make sure he gets taken care of, hes absolutly beautiful, and i want to keep him that way.
We have a 75g, running a fluvul fx5, the led lighting system, parameters are good, amonia did spike a bit after the addition of some new fish but we have an amonia filter in place and it is falling back into place. I have a foxface, 2 orealus clownfish, 2 domino damsles, one blue velvet damsle, 2 yellow fin damsles, a blue heptas tang, a yellow tale wrasse, the lta and the sally lightfoot cra. And a mandarin goby currently in a quarentine tank with ich.
*recently lost the flame angle who was in the quarentine tank with ich aswell. treating with medication, mandarin seems to be doing better thatn the flame angel did, the ich almost looked as if it had started to eat throgh his scales on the side of his body, poor thing
When I first put him in the tank
Under the shelf rock
With the domino damsles

 

[bang guy]

The LTA looks severly bleached out to me, perhaps it's just the lighting but from the picture it looks almost white. Other than that it seems to be doing OK. If it stays OK it should be able to grow back the Zooxanthellae that is has lost. It will eat when it gets hungry. No reason to try to force it.
For the shrimp, yes it's possible they were eaten by the Anemone, not likely though. The typical scenario with Cleaner Shrimp is that they become very stressed when moved into a new environment. Stress causes them to molt prematurely which even more stressful. When they molt they always try to find a hiding place so will see to disappear for a few days.
The one you saw dead, are you sure it was a shrimp and not just a shrimp molt?