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Well, I get spot algae pretty bad on my 55 -- and when I tested a bit ago, I thought I had high P04 (2ppms+) so I haven't been adding P04. I thought perhaps my well water was high in P04 like some are. But, I must have run the test wrong since after reading this thread I decided again, and it came out .1. So, I'll try the P04.

(I did remember I kept trying to squish the cap all the way down in the tube like the AP test kits, but this is made differently and I didn't realize that. I wondered why they made directions that had too much liquid to put the cap on right! -- anyway, realized today the cap only goes part in, so maybe that contributed to the discrepancy).
 
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