Phosphate level problem
I've been using a Seachem Phopshate test over the last week to test for the phosphate level of my 6g Nanocube, and it's reportedly at 3 mg/L! About 3 weeks ago, I was adding a tiny, tiny amount of phosphate to bring it to 1 mg/L. However, I neglected to test the tank shortly thereafter and after 3 weeks (and 3 water changes - 1 per Sunday), the Phosphate level is STILL 3 mg/L!
What is the deal here? I would think that 3 50% water changes over the period of 3 weeks would have lowered it? I haven't added any in that same time frame.
I suppose my main reason for posting is my quickly growing green "somewhat fuzz-like" algae growing on the glass. It's not green spot algae - I can use a paper towel and rub it off without any problem. Lighting is 18w PC (single tube fixture) - with Excel dosage at a little above bottle recommendations.
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Dwarf Gourami, Cardinal Tetras, Julii Corydoras
Coralife T5NO (2x28w), DIY Yeast CO2