12-04-2008, 05:23 PM
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The Chinese algae eater will get to six inches for sure, although I've heard of (and seen pictures of) big fat ten-inchers. It's hard to say when it will turn aggressive, but it is almost a certainty. I would return the one in the 25g tank just to be safe. A great alternative is a smaller species of pleco, like the bristlenose pleco. It will stay small, won't attack other fish, and is much better at eating algae. Just be sure you've got some driftwood in the tank for it to gnaw on.
The reason I ask about the tank dimensions is because a longer tank allows for more swimming room, so would let you keep something that's more active like possibly smaller rainbows or rummynose tetras. A taller tank won't be as long, so you'll need less active fish, but has more vertical space so might allow for more types of fish.