That sounds like fairly typical behaviour for clowns, they often act freaky for a few days till they start to feel more comfy in their new home. Hard telling if they will host the LTA or not, clowns have certain anemones that they normally host in the wild, some never adapt of seem to need to host while others will try to host with anything, only time will tell.
You mentioned these are the first 3 fish in the tank, how long has it been setup, what size?
I am concerned that adding 3 fish at once may cause a slight ammonia spike while the biofilter ramps up to meet the new load. Clowns are not nearly as tolerent of ammonia/nitrite as the much tougher
damsel fish
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I'm not going to wake you, I'll go easy on your heart
I'll just touch your face and drift away , like smoke rings in the dark