By the end of my light cycle for the day, I may have a few brown spots on the sand bed. I will take a pic of this tonight. No Cyano at all. My glass may need to be wiped with my magfloat every other day and it's just a light brown algae that comes off. You have to look from the side of the tank to see. API Test Kit, kit is probaly a little over a year old. My LFS told me to try to move my hydors all to one side (which is 4 of them) because the way I have them now (two on each side) has them working against each other. He said this causes dead spots and doesnt help my problem.. I'm willing to try anything at this point. I've failed to mention I dose with different kent additives. doubt this has anything to do with it.