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i'm not sure about shrimp, but i know i don't want that many otos haha. but the shrimp would like the java moss i'm growing. but i also saw otos on sale at my lfs for 1 a piece
5-10 sounds about right. But realize that they only eat some types of algae, and will not touch other types. So if you are only getting them for algae control, be sure you have a type of algae they will eat first.
I had five (now 4 ): ) otos in a 20g. They never finished eating the algae in my tank.They roam around all day grazing leaving literally a layer of poo all over the place. I think 10 is a good number for algae control. I suggest a mix of algae eaters: Shrimp for detritus and thread, otos for some fuzz algae, thread, diatoms, dust algae, nerites for gsa, mts for general crap that builds up everyhere.