Alright, I'm getting mixed responses from every direction it feels like.
My tank is not going to please everyone no matter what I do, but I'd like what is best for the fish.
So far, with my current regime, and my biweekly water tests have shown no detrimental signs for months. My 3 otocinclus are fat, my betta is happy and blowing bubble nests.
I only wanted to know if I could add more otos to make sure my current otos were happy, so...
SUMMARY: Please only comment further if you have (1) previous experience with owning otos, or (2) have a link to a website with information on oto care.