I honestly don't know. Frag it into pieces to see if your can save it. It may help reveal the actual problemI hope it's not RTN, I WORK SO HARD ON KEEPING UP WITH TANK MAINTENANCE. never neglect, always change water every 2 Weeks, clean skimmer 2 times a week change filter socks as often as needed just don't get it why this is happening with all levels on point..@trio91
Picture? Maybe its from something else that may have migrated. But I don't knowAnd I've noticed small ployps growing on other rocks all over, about 10-15 little pieces,@saltkreep88 @trio91 @Sunny