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When I began to add more PO4 and K (about a month ago), I noticed a brief proliferation of spot algae on both the front glass and the leaves of Cyperus helferi. I scraped off the first "bloom" and it hasn't come back.

Sometimes you'll get hiccups like that when you're changing your nutrient regimen. If plant growth improved with the added PO4, then I wouldn't worry about the spot algae. It should go away.
 

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I had the most success with this plant when I was running a non-CO2 setup with about 2.2wpg and a soil substrate. It grew about as fast as Anubias, and it was more brown than red, but it most definitely grew.

The new leaves that it put out were shaped the same way as the ones on the plant when it arrives, but they were a little smaller.
 
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