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Short term: total tank blackout for 3 days. Leave the lights off and cover all 4 sides so ambient light doesn't get in. Do not put any food in the tank during the blackout. After the blackout, do a large water change. Do this, and you should notice an immediate improvement, BUT it will only be a short term one.
Long term: you need to get a handle on the root cause of the algae problem. It is likely either too much light, or overfeeding the tank, or both. Being overstocked will not help the matter either. For lighting, look at not only how long the tank lights are turned on (no more than 6-8 hours per day), but also what other light is getting into the tank from the outside (is the tank in a brightly lit room? Is it near a window where it is getting sunlight?). How much and how often are you feeding the fish? They have very small stomachs and really only need a couple of flakes per fish per feeding. Only feed once or twice per day. Also consider how often you are performing tank maintenance. Are you changing some of your water AT LEAST every other week (every week is better)? Do you vacume the substrate regularly?
If you can get the bulk of the problem under control, then you could turn to livestock to help maintain minor, incidental outbreaks. Otos, as you mentioned, also some variety of plecostomus...I like bristlenose for smaller tanks. However, plecos are waste machines, so if you are already overstocked, I would think twice about that.
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