Long green strands. Easy to pull off by hand. I've seen strands of this stuff over 4 inches long.
Primarily a problem when there is excess iron in the water. High iron normally results from excess fertilization, but some water supplies have high iron levels (especially well water). When I was over-dosing my 29g tank with Seachem Flourish, I got lots of this stuff. Reducing dosage of iron containing fertilizers completely eliminated the problem. I've seen my Tiger Barbs, SAEs, and Algae-Eating Shrimp all nibble at this stuff.
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