11-05-2008, 01:41 AM
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To add to what onefish2fish said about the otos, some of them can be very picky eaters and might only eat algae or possibly algae supplemented with fresh greens like spinach. I would only add them to a mature tank that has a lot of algae growth to sustain their diets.
A small species of pleco, like a clown or bristlenose pleco, would be able to stay in the tank long-term, but both species would also require driftwood in the tank to supplement their diets. Common plecos grow too big too fast, and I just find something wrong with the idea of replacing a fish with a younger specimen whenever it outgrows your tank.
Siamese algae eaters and Florida flag fish are both excellent at eating hair algae and would be suitable for a tank of your size.
Snails, such as mystery snails, will eat algae but won't clean your glass for you. Some shrimp, such as amano shrimp, are also great algae eaters.