I have a 20 gallon tank with about 14 inches of fish in it, and I want to add an algae eater. However, all of the ones that I've been able to find get to be huge!(no less that 16 inches) Are there any out there that get to be less than 6 inches?
For Brown Algae the Otos really shine, but as was mentioned they really do need to be kept in groups. Three or so should be able to handle that sized tank but I would not add less. They will not add much to the biological load to your tank though. A Mystery Snail is also good but not quite as good on the Brown Algae as the Green types. (although they do keep the glass clear pretty much, decor is another matter sometimes)