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I have a 20 gallon tank with 3 swordtails and 3 fancy guppies. I want to clean the algae out. I have pleco's in my other tanks, so I want something new.
A clown pleco will eat some algae but also needs some driftwood to munch on. If you've got hair algae, then you may want a siamese algae eater. Just make sure you get a true sae and not a flying fox.
If you wanted to you could try some apple snails. Put three in my tank a couple of weeks ago and they seem very happy cleaning the rockwork for my cichlids. They also seem to be doing a better job than my goldnugget pleco. It's just a thought.