02-18-2010, 10:45 AM
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I'll give you my standard spiel on this subject.
Never buy an inhabitant to do a "job" in your tank. Be it plant or animal buy them because you like them and want to see them in the tank, not because you think they'll provide some kind of benefit. Never forget that they're animals and they're animals out of their natural habitat. An Otto may or may not eat the kind of algae you have. They may or may not be sufficient to keep it trimmed down. They may or may not learn that the food you supply the tank is a heck of a lot less work to get than the algae you're expecting them to eat. There may or may not be sufficient algae in the tank for your ottos to survive off it alone.
Sadly, there are no answers for any of these questions, none. So you have to be prepared for the worst case, which is that the ottos will show absolutely no interest in your algae. Do you still want them? If the answer is no then don't get them. You can and should control algae through other means.