he could have placed the fish in a 20 gallon rubber maind container and treat them there while the ich dies off in the reef.
the thing is ich lives in nature and fish i nthe wild live with it. they do it because the slime coats they have are very healthy and they aren't stressed so their systems are able to fight of the ich. try and emulate nature, feed the fish with high nutrience (brine shrimp is poo) keep water columb good and you shouldn't have many issues unless they are large problems.
as far as the BTA try feedign it mysis shrimp or homemade fish food. keep the natrates low and the lighting high. the anemone might also still be acclimating to the new environement so try and give it time