I don't remember where (and didn't bookmark it), but at one point, Dr Ron (I believe) had pics of the two types of bugs. One is a harmless critter, the other was the dreaded red bug. They looked very similar and both live on Acros. My experience is that I know for a fact that I didn't have the bugs until October of 2001. At that point I added a frag which I knew had the bugs as I could see them very easily. This is when both Dr Ron, and Eric Borneman had stated that the bugs were probably harmless, which is why I still added the frag even though I saw the bugs on it before I put it in the tank. Within 2 weeks, the bugs were on most acros, and all of my tri-colors lost their color and turned light tan. Several blue Acros also lost their color, and some of them began to lose tissue. In April of this year I had a large red slime outbreak, and decided to treat with Chemi-Clean. After doing the recommended 2 treatments over 48 hours, I noticed that over the course of the next 2 weeks, the color began returning to my tri-colors, and the blue Acros began to re-grow tissue where it had been lost, and also to color up. I took a closer look, and discovered that there were absolutely no more bugs anywhere. Over the course of the next 4 months the corals all showed excellent color and growth, with no signs of the red bugs. I then made the idiotic mistake of not looking over a frag that I got at a club meeting before adding it to the tank( it was late at night, and I was tired). The next day I inspected it closely, and found out that it was covered with the bugs. I promptly removed it, but the damage was done, as within 2 weeks, the color was again lost from my tricolors, and most of my colonies had some bugs. Like Graham, this is just way too coincidental for me. I believe that certain corals are more sensative to the bugs. I realize that there are many Acros that do just fine with them, and my tank currently is doing great. The corals which are still in it are all unaffected by the bugs with the exception of 2 tricolors which are now light tan. Some corals that originally lost color, have regained it (including several tricolors) which makes me wonder if the corals might adjust to the bugs over time, and become acclimated to them to the point of no longer being stressed by them. I don't like the bugs, because I know that several of my corals do much better without them, but I also don't think it's the end of the world. I do think people need to warn anyone that they trade or sell to if they are giving corals that may have the bugs. It's just common courtesy in my opinion.