thanks for the reply,i know about the three treatment deal.i used 11.5 mg tablet for roughly 200 gallons of volume.after 12 hours there was about 90 percent gone,but a few small ones still crawling on the coral that had the most.its a samoensis.instead of doing the water change and running carbon,i added another 11.5 mg tablet and left it stew overnight.this morning not a bug in sight.also no dead hermits that i see and the only shrimp i have is a huge coral banded,which looks fine.the tank is a 180 with a 40 gallon sump.i figured the rock displaced about 40 gallons.anyway it worked like a charm at the dosage i used and polyp extension was better than usual.i did the 25 percent water change at the 23 hour mark.it is an old mature reef and i guess i did not account for all the plumbing,closed loops,skimmer,cal reactor,returns ect.that may have been the issue or maybe they would have died with out the extra 11.5 mg,if i waited it out.thanks for looking and info. sorry about the avatar,i did not realize it was so big.
