Yes they should be kept in groups. They suffer psychological stress if kept alone or in small groups.Subsequently, one may also ask, how many OTOS can you keep together?
Tank Size. Otocinclus are social fish, living in shoals of thousands in the wild. Because of this, you'll need to keep at least 6 in your tank – 10-15 would be better. Preferably in a 20-gallon tank, however, if you only want to own 6 Otos a 10-gallon tank will be okay.
Subsequently, question is, why do my Otocinclus keep dying? When you get them, pick the ones that have been there the longest and have fat, round bellies. They are picky eaters and sometimes starve to death especially if the LFS keeps their tanks really clean and don't know how to feed them. If you get fat ones that means they are eating and should transition well to your tank.
Herein, how many Otocinclus catfish should be kept together?
Keeping Otocinclus Catfish Together These are social creatures that should be kept in groups of at least four. The bigger the group the better – just make sure the tank is big enough.
Do I need to feed Otocinclus?
As far as I know ottos need to eat 24/7 to be healthy, So giving them veg a few times a week is not sufficient if the tank doesn't supply additional food for them to munch on. So far I've figured that having round pebbles around the substrate helps a lot. They love munching on the algae that grows on them.
Do algae eaters eat brown algae?
Vacuuming is important to ensure the algae will not grow back as quickly. In a freshwater aquarium, you can add a sucker-mouth fish that will readily eat brown algae. Stock one plecostomus or several otocinclus catfish to do this job. In a saltwater aquarium, many species of fish and invertebrates are diatom grazers.Can Otocinclus eat cucumber?
Most otos prefer blanched veggies. Blanching is a quick cook mostly to soften the vegetable to make it easier for the oto to eat. There are a few youtube videos on blanches cucumbers for fish.Will Otocinclus eat moss balls?
No, they won't eat them, at least not in any significant way. Marimo (cladophora) is a hard filamentous algae so it's not easy for them to munch on.How can you tell if an Otocinclus is male or female?
It is not that simple to tell the gender of an otocinclus, since the males and females have the same coloration. You need to wait until they're nearly adult size before the differences are noticed.How many Otocinclus is 75 gallons?
An established 75 could easily support upwards of 10 otos.Will OTOS eat algae wafers?
the algae wafers are meant as a diet supplement. if they are getting enough food without them, the don't need them, but if you aren't sure that they get enough to eat, you can drop a half of one in ever so often.What algae will Otocinclus eat?
They specialize in eating soft green algae; often this algae is hard to see without looking closely for it. The otocinclus will eat it before it grows too long and gets out of control.Do Ottos eat black algae?
Otocinclus (also known as "Oto") Otos are very peaceful and stays small (2 inches). They do a great job in eating algae but unfortunately only really soft early form of algae. If your tank is infested with hair or black beard algae, do not buy this fish to clean those - Otos don't touch those algaes.What do you feed Otocinclus?
An Otocinclus feeds on soft algae buildup growing on hard surfaces of the tank. That's why its important to make sure the tank is clean, but not “too clean”. Otocinclus food can also include supplements such as algae wafers and even some fresh vegetables like green zucchini slices.Are Otocinclus wild caught?
Otocinclus cocama, Zebra Oto, one of the less common Otocinclus species. At this time, virtually all Otos are wild caught, not farmed. At least a deworming program is a good idea, before you put them into a tank with anything else. All fish should be quarantined first, though many fish keepers don't bother.How long do Otocinclus catfish live?
3 to 5 years
Is Otocinclus nocturnal?
They are not nocturnal; I suspect they can be pushed this way in a crowded or boisterous tank but in a peaceful environment you will see a lot of them in daylight hours. The split their time between resting on leaves and bogwood and active feeding.Can Oto catfish live alone?
um, otos are most DEFINITELY schoolers, they school like tetras when housed in proper groups. Often folks like to keep them singly or in small groups, which makes them withdrawn, less active, and not nearly as much fun to keep. Just because they survive being kept alone or in small groups, doesn't mean they should.Will Oto catfish eat shrimp?
The Otocinclus Catfish is the only fish we know of that is not likely to eat shrimp fry. While most fish will prey on dwarf shrimp fry, a heavily planted aquarium can be very helpful in offsetting this predation.Can Otocinclus live with bettas?
If you're wondering whether an otocinclus and betta can live together, the short answer is yes. However, that doesn't mean you should go out and buy an otocinclus to introduce to your betta.Do Oto catfish eat hair algae?
Otos won't eat hair algae, but I'm not sure that's what you have.Can Otocinclus tolerate salt?
All scaleless fish are sensitive to salt and great care must be used if treating a tank with them. Otocinclus need to be kept in groups, not singles, so that may be part of the issue also. They should be in well-established aquariums. 
