Ok, was wondering because I recently fragged some colt coral and only waited about 5 mins before placing it back in. Since then it hasn't looked healthy and my leather also seems to be aggrivated? I also have frogspawn and star polyps which do not seem effected? Just trying to figure out the cause of this. Tested all levels and only thing not zero is nitrates which are at 15, but they'ved always been around there? Oh well, guess I'll try to think up something else. Thanks all