Barbara;312723 wrote: Dakota, in my experience you'll be fine, but you might lose a polyp or two, and they might take a little longer to come back to full glory. When I had zoa eating nudis, I dipped every zoa I had in FW. Without thinking I took all of them (several colonies) at the same time and put them in FW, and then picked out colony after colony, carefully scrubbed them, went over them with a magnifying glass and picked off nudis and egg sacs. The last colonies I cleaned had been in the FW for 20-30 minutes. They all survived, but I lost some polyps. The ones that had been in FW for 30 minutes, I'd say I lost close to 33% to 50% of the colonies, but none died completely.