Just a first question, what size is your tank.. because sailfin tangs need a minimum size tank of 125G..
Anyways, what you did was a bad idea. You really shouldn't be cleaning anything yourself, besides algae or corraline on the glass. There is no need to blow anything off of the rocks or sandbed, whichever you have that makes up the bottom of the tank. That is what clean up crews are for. Snails, hermit crabs, some fish, crabs, and other inverts that are sold as clean up crews for aquariums, all eat decaying matter, detritus and any stuff on your rocks. You shouldn't even have to mess with the live rock after you have put it in the tank. Unless you have aptasia and you need to kill it. Doing stuff like blowing debri off rocks, or the sandbed, could bring harmful decaying matter up in to the water column.. which could make your fish sick.. I would not suggest doing that again.