Treating....<ick?> or <???>

[jassz]

Hi all. I'm not sure if I have a problem or not, so I'll just describe the situation and see what you think.

I bought/moved an established tank May1. It is 135g tank with a 40 g sump. It contained some live rock, some base rock, a White tailed trigger, a picasso trigger, a lionfish, a wolf eel, a valentini puffer (and another puffer who seemed unhealthy from the start and died a few weeks later, condition not related to the current problem).

Everyone else has a healthy appetite and they all get along reasonably well except the two triggers occasionally 'argue' at feeding time, and the lion fish occasionally chases the white tailed trigger out of 'his' spot.

From the very beginning, the white tailed trigger would bash his body up against the rocks and side of the tank as he was swimming by. The picasso trigger does it a bit too, but not as much. I wasn't sure if he was itchy, or if he was trying to roust out some food to nibble on. I couldn't find out if this was normal behavior for triggers, but as he seemed healthy I let it pass. But, now he is doing it more and more. So much so that his scales are starting to look roughed up from the bashing on the rocks. I kept watching for spots but saw none, and I figured it would be pretty visible on a dark brown fish. But maybe he successfully knocked them off? Anyway, about a week ago I decided I saw a few white spots on the lionfish, and treated the whole tank for 3 days with something called Anti Ick. I thought the spots disappeared from the lionfish, but now... sometimes I see them and sometimes I don't. Do they fall off??? The triggerfish is definitely looking even more roughed up. I've been trying to get a pic, but so far they all look unclear.

Should I try another course of Anti Ick? Should I try moving Bambi (the white tail) so a separate tank? The whole tank needs to be treated anyway, right? What about the live rock?

If it is Ick, where did it come from? I didn't introduce any new fish, and I don't feed live food.

BTW, weekly I replaced about 10 gallons of water. My pH is around 7.8, SG 1.022, ammonia, nitrite and nitrate negative. Occasionally I get a trace amount of nitrite or nitrate, but ammonia has always been negative.

Thanks,
jassz