Algae algae algae

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Argonian
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In the past couple of months the algae on the glass has been growing really quickly, it's a brownish colour, it's easy to scrape off the glass.
This is in both tanks, 240l and 40l. Both have bogwood and live plants in. The plants get a sort of black algae (BBA?) on which, in the big tank, the Siamese algae eaters keep down, but they never get all of it, they just stop it from getting hairy.

I'd say about two months ago I cut off loads of leaves that were badly affected, and I began dosing with TNC lite fertilizer because all the plants looked pretty unhealthy.

Could this be causing more algae than usual?

I can't think of anything else that's changed in the last few months to cause the spike.

Thanks
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Martinspuddle
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High tech or low, parameters, pictures, setup? :]
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plankton
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If by using ferts you're getting more algae that will usually point to a lack of CO2 for the plants to use to photosynthesize.
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