No offense, but I think you are doing too much at one time. Water changes, chemical/mechanical filtration, and extra water flow/aeration can control cyano. You can reduce the photo period or leave the lights off for several days to hault progression. Adding kalk will not make corralines appear over night and if anything unbalancing your water chemistries moreso. You just dosed the tank with E, which is a known destroyer of nitrifying bacterias and even at low concentrations could still be problematic. Stick to one thing until your cyano is under control. Elbow grease never hurt anyone By the way, you have 2 skimmers on a single tank?