hi jesse. welcome to TFF. hope we can help. Ottos are good at eating algae but not all types. they are better at preventing it. even though they are social put 3 or 4 in and see if they start eating it. if this is the case get two more. they will be fine in the tank providing it is not already overstocked!. i have 6 in my 120ltr tank and i have never had any algae! they are cute little peaceful fish and are great. Also i advise putting some zuccini in the tank (corgette) once a week and leave it in there for 48 hours so they have something to eat as they are veggetarians. a fat otto is a happy otto! i also put sprouts in my tank and they like that but zuccini is the most popular. hope the holiday was good! anything else dont be afraid to ask or private msg me!. Hope that helped.