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That looks a lot like the Ulothrix I had. I didn't have as much at that, just the odd stray hair. If I let things slide, going away for the weekend, for instance, when I got back there would be very long, green hairs spanning the tank. When I was there to hassle it, it turned pale - almost...

Do you have any photos of it?

Just because it is green and long and thin, doesn't mean it's spirogyra. It might be Ulothrix (which is hard to tell apart from Spirogyra, without a microscope). I had Ulothrix recently. Hassling it before a water change, to get it water-bourne, then syphoning it up, was how I handled it, in the...

By hand, using white filter floss. The perfect algae scrubber. You can usually buy a bag for less than a pound in your LFS.

I remember reading his thread before anyone even posted a reply. It hasn't changed since then.

You disagree. That's fine with me. You have your own theories. I respect them. I can see merit in some of them. I'm talking about increased numbers of micro-organisms (bacteria and protozoa etc.) as well as different types which aren't usually present in great numbers. Since it was a hunch, and...

I've added some italics to my previous post to save you the effort of having to read it carefully.

My own hunch - and this is just a hunch - is that when plant tissues are weakened, a localised micro-climate of different microorganisms, either feasting on decaying material, or feasting on each other, builds up around the tissues, creating a soup of microorganisms and organic by-products...

How long has the tank been up and running? Is it cycled?

A UV steriliser might be a good short term fix. Once the plants establish themselves diatoms shouldn't be able to get a foothold. Like ceg4048 says, plants can utilise silicates. In fact, they can use silicates at an astounding rate. (In the past, I've used potassium silicate as PH up with...

The best way to control hair on vallis is by pruning. Trace the affected leaf-strand down to the bottom and strip it away from the crown.

You can pick up 6% v/v hydrogen peroxide from most chemists (the bottle says it can be used as mouthwash). It does work with beard algae. However, there's a possibility of trashing your filter. Hydrogen Peroxide tends to break down into O2 and H2O within 24 hours, so if you are set on using it...