no and i have cyano before and it would take about a day to come back all the rock in those pic i took a tooth brush to them yesterday and then took my turkey baster to them 5 or 6 times in 4 hrs and within ten minutes the rocks were fuzzy again so i dont know cant find anything that looks like it so i dont know everything in the tank is happy and healthy my tang clowns and snails and hermits are eating it but they cant keep up