I have both my tanks in the corners the dont see sun.. nor do i run light so i dont get algae... But have u tried a water vinegar mix? Rinse well ... sorry i cant think of anything else that isnt a chemical.. Or clove oil..... but that may be toxic??
To reduce algae in the tank - test the water for phosphate, high levels cause the kind of algae that's hard to remove - the only way to lessen the algae is remove the phosphate - there are a number of products that you can put into your filter that absorb phosphates & will leave your tank clearer as well.
You can also try some algae eating shrimp, but as I tell people that try to use any type of algae-eating animal for that solution, they often don't eat enough to make a difference so they'd just be there to look cool until they become snacks
I'd suggest trying to block off the tank from light, but since you seem to have live plants I'd hate for you to kill those....I'm going to second the suggestion to do the phosphate testing first since that will probably be the least damaging to the other plants in your tank to start off with.
Are you sure it's algae? It looks more like a food deficiency to me, do you have any root tabs beneath the sword? If not put one under it and it should improve
Tried it & failed : roll eyes:
I also tried dunking in a 10% beach solution quickly (10-15sec) & then due chlorinating for a day in heavily dechlorinated water - this too failed miserably (plants turned to slime in a mater of days!) removing the most affected leaves whilst hoping new growth sprouts back then trimming older leaves once new growth appears is probably the only way to reduce it.
I'm pretty sure that's an anubia not a sword & I'm guessing its attached to driftwood so no fertiliser tab will help that. I've had similar on plants & had VERY high phosphates, since adding various phos reducers I haven't had a problem.
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