Another algae problem...Can anyone identify the type?

[Nauriel]

Well, just about a couple months ago I fought off a nasty blue-green algae attack with the help of some useful Maracyn.

My tank was completely algae free for quite a time, but now algae is coming back, and I'm pretty much certain that its not blue-green algae.

For one, its a completely different color. This algae is a bright green, sorta like the color of new buds on a tree. Its coated the one side of my tank and is starting to encroach on the other sides. It wipes off very easily, but it doesn't smell like the blue-green stuff. Also, it started off just coating stuff; the side of the tank, the gravel. But it seems that almost over night, its started growing in bunches. By that, I mean that there are several clumps of this stuff growing in the water (connected to a plant, the decorations, ect.) Some of these bunches look almost like spider webs, because they are strung between two anchorage points. These bunches are made up of strands, so I think it might be hair algae. However, I was also looking at pictures of regular green algae and it looks pretty much the same. I can't tell the two apart.

As for the conditions of my tank:
5.5 gallon
filter
heater set at 78 (though I had my window open lat night, so the water probably got a bit colder)
1 betta fish
water quality is good (no nitrites, nitrates, or ammonia) although the pH is pretty low (about 6.3)

I also havn't done a water change in a while, so that may have something to do with it too.

Any help is a appreciated. I just want to know what type of algae this is so I can get rid of it. Stupid algae...

[JingleAllTheWay]

I couldn't tell you what type of algae it is. For a while I had a big algae break out in my tank. It was awful. But then I later realized that it was part of a cycle (which I knew nothing about because I didn't research). I just kept scrubbing and finally it went away. You could get those tiny algae eaters. They are super cleaners. They're only about an inch long I think. Hopefully someone else has some better advice though for you.