Maybe try a clown loach or see if you can find a bigger pleco?
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Clown Loaches don't eat Algae. They need groups and big tanks. Like 125g or larger.
To the OP, Test your water. Don't buy an algae eater to eat algae. Buy a fish because you like it AND it suits your tank.
If you don't have the right kind of algae the fish can starve. They don't eat every kind.
Otos are awesome, but sensitive and need groups. Great little fish.
I'd recommend 5-6 Otos once tank is stable.
Or 1 Bristlenose Pleco...but make sure you feed it. Blanched Zucchini is good. Omega One Algae Wafers. Don't feed every day, but offer some food.
Plecos poop almost as much as they eat. Don't buy Common or Sailfin Plecos. They both hit 12" or more.
Planet Catfish and LiveAquaria have decent info.
Not all Plecos eat algae. Some are Wildcaught. Some get huge. Do your research before buying.
If you are getting algae, reduce light. Buy Timer , only use lights 6-8 hours daily.
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