Someone on a local aquarium site to me posted this pic wondering what the algae is. I was thinking diatoms but the red color is making me wonder. Any ideas?????
Ask them to look closely or take a close-up of the red stuff. Is it small tufts? Here's where I read BBA can be dark red. http://www.csd.net/~cgadd/aqua/art_plant_algae.htm
If that's what it is, Excel usually works well to treat it
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