I dunno how many gallons for sure but its around 30-40G Its soft water so its not good for snails and like on the other previos posts...lil bro scared of plecos for sum reason 0.0....
siamese algae eaters are great, I would get at least 3 or 4 though, but do a good job and aren't typically aggressive. They will however try to school up with the other fish in the tank lol.
rather than gettting any fish to clear up the algea, i would black out the tank for a couple days. I plan on doing that with my tank, which was sigested by someone on my algea thread (i don't remeber which). what other fish do you have in this tank? my Corys nibble on the algae and so do my guppies. I wipe the walls down when i do my water changes and my algea hasn't gott much worse.