Just a few things to add.
The reason a UV
unit really wont damage your corals is because it is only going to KILL those things that come into direct contact with the light. While a properly configured UV
as Dr Ron said will kill all plankton that passes through it
what it wont do is kill plankton that does NOT pass thru it.
Unless you have a very HIGH wattage UV
bulb on your tank with it inline with your main circulation pump so the water in effect comes into contact with the UV
several times an hour you wont run into a case where its killing to many benifical things.
Ich is a parasite that has various live stages and only 1 of those stages is visable to us in the white spots on the fish. You should consiter your tank at risk of an ich reinfestation for a period of 1 month after you see ich leave the fish's body.
In addition the UV
filter will be of little help to the ich parasite when its doment in the substrate. The only real time the UV
would come into play would be when the parasite is in its free floating stage in a search for a host. Or immediatly after the cists burst on the fish and release the larva back into the water column and before they have a chance to settle onto the rocks and substrate.
As you know keeping yoru tank warmer will help fight off the parasite as it can not handle the warmer temps as well as the corals and fish.
The garlic comment I am supprised at. I would not have suspected Dr Ron to be using something that has not been found to be scientificly benifical to fight ich. What garlic has been observed to do is to help rid the fish of the visual life stage of the parasite. Its not really known why this happens. Some say the garlic oil increases the fish's slime coat. Others say the garlic increases the fish's appitite thus increasing its immune system and overall health.
As of the last article I read about garlic it stated that there was yet to be any true scientific evidence as to it helping to rid your tank of ich but there are many hobbiests at all levels that have used it and experenced benifical results.
Acutally I did not know kevin was a big fan of Dr. Ron. Unless you ment that in a scarcastic way. We do suggest his articles on DSB
's but I dont know how far beyond that his passion for the man extends.
The likly suspect is stress from the move from the LFS
to your tank.