You know something I am really tired of this cyano. I've been trying to get rid of this for 3 or 4 months now and it doesn't want to leave. I changed my lights just yesterday and the stuff just blew up in one corner. I have enough water flow, 1 powerhead in each corner. I added some phosphate sponge and that doesn't seem to help. I only feed 2 times a week, change water every week. What now? I never had this stuff till recently and this tank has been running over 2 years... :hang: