How did I kill my fish?

[midgetwaiter]

I've lost a few fish recently and I wanted to see if anyone else had an opinion on what might have caused it. Here's the story:

I moved my BTA from my 12g to my other system and took some of the zoas from the other tank that weren't liking the MH very much back to the 12. I moved around a bunch of the rock but left the fish, two ocelaris clowns and a dime sized blue tang to move later. The next day the smaller clown and the tang were nowhere to be found and I had a nasty rash on my arm. I thought maybe I had kicked up a bunch of stuff from the sand (> 1 inch layer) so I tested the water but it was fine. Then it occurred to me that it may have been aggression that was the problem as it was the dominant clown that was left and she seemed a little upset that the BTA was gone. I didn't think much of the rash.

Yesterday I pulled the clown out and moved her to the other tank and put my dwarf lion in the 12. Today the lion is dead, my rash is back and I can't find my sea hare. I don't remember seeing the sea hare out at all after moving the rock around either. I think I either mashed the sea hare or annoyed it enough that it dumped a toxin on me, I've only had it a couple weeks so god only knows what it had in it's system still. My corals and snails are fine and there is nothing obvious I can see on the lion fish so I think that's what has probably happened. It would maybe explain the rash as well.

Anyone have some thoughts?