red algae

Cyanobacteria builds up in areas with inadequate flow. Add more flow or adjust what you have now to hit those areas where the cyano is growing. When I had this problem, I scooped it out from time to time and with the added flow, the problem eventually went away.

Good luck.

Roger
 
Siphon out the cyano and add fresh carbon. Worked for me. A lot of times if you adjust the flow to blow it away it, you will just be spreading it around.

IMHO
 
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