12-16-2009, 05:30 PM
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I wouldn't suggest otos if there is not sufficient algae for them to eat; and they will only eat the brown and normal green algae. When first introduced, otos are usually quite decimated from capture, shipping, etc., and if sufficient algae is not already present they often starve within a few days. If there is algae, and they should get rid of all or most of it in time, they will (in my experience) quickly start feeding on tablets and sinking food along with other catfish. But from what I have read, in a tank without algae they usually don't adjust upon introduction.
Second point is be careful about "cleaning" fish that are being acquired for some purpose but not because you really want them as interesting fish. Fish take up space which means they contribute to the bio-load of the tank, and the smaller the tank the more effect 3 or 4 fish, even smallish ones like otos, will have, limiting other acquisitions and, more importantly, contributing unnecessarily to the biological load. Unless you really want the fish, it should not be acquired as a "cleanup" crew because none of them really do, or if they do some "cleaning" they contribute negatively to the bio-load as I said.