03-03-2011, 10:32 AM
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It is algae, I would say one of 3: hair, cladophora or thread. Regardless of type, cause is much the same: light.
Plants can only use the available light if all 17 nutrients are available in balance. As most of us end up with excess light, algae takes advantage. Higher plants can out-compete algae, but when something is missing (the minimal factor to plant photosynthesis, as it is known) the plants slow or even stop photosynthesizing and algae takes advantage.
Algae is natural in any aquarium; but we keep it under control. And some types will appear in this tank but not that tank, often for no known reason.
If you can detail your light (type, kelvin, watts, etc) and how long it is on, and what fertilizers you are using and how often, I may have suggestions. Also, a full tank photo so I can see the extent would help.