I believe OC has a tank she lets get overrun with algae specifically for her otos.
The tank does not get 'overrun with algae' with 24 otos in there! I do have to make 'algae logs' and 'algae rocks' in a 5gallon tank tank with 1 gallon of water in it. It has a 10watt light over it, so a bit 'overkill' as far as the WPG rule goes. They also eat lots of veggies.
I do agree that otocinclus should not be added to any tank unless its well planted and stable for 6 months or more. They are very stressed when caught in the wild and unless the tank is mature, they are prone to dying in captivity.
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