I’ve been having a problem with Cyanobacteria for a couple weeks now. At first I bought a better cleanup crew: sally light foot crab, Hermit crabs and a star fish hoping they would help with the problem. After a week with now improvements I turned my lights off for three days and stopped dozing reefroids altogether. After three days I turned my lights back on gradually each day and it still was present. As a last result I bought some Chemiclean. I have approximately 80 gallons of water and I does my tank with 6 scoops of Chemiclean. After 36 hours there was no change so I used two more scoops of it. The next day there was still no change so I used six more scoops of Chemiclean and turned my Nero 5 power head to 100% for 24 hours. When I woke up this morning sans was all over my live rock, from my power head, and I couldn’t see hardly any Cyanobacteria. I did a 20 gallon water change this morning, got all of the sand off the rocks, leveled out my sand bed and an hour later it’s back.... Any suggestions???