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Google.."James algae guide"
I suspect lighting is driving more demand for nurient's and more CO2 than DIY can provide.
I would reduce lighting either in intensity,duration of lighting period,or both until I could correct the problem.
It is the light that drives demand for everything plant's need for good growth.
Reduce lighting,and you have less demand for nutrient's and CO2.
Would alway's adopt consistent form of fertilization even with lower lighting.
Plant's will use up the nutrient's and CO2 available,but if lighting is too much ,for too long,,then plant's struggle to get enough of both= algae which need's much less of everything.
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