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Same here. My refugium is oversized and even at the recommended 10x flow through I needed extra circulation.I get cyano now in my fuge in areas of low flow also. In fact I had to add a small powerhead to increase the flow. I guess that goes back to the 10x flow rate lol
No3: Red Sea-1ppm I also used an API as a double check and got: 0ppm
P04: Red Sea-0.04 to 0.05