I've read that ottos should be at least 6, i have 5 because one died 24 hours after purchase. Anyway, it seems to me that 6 would be too many because it would result in a lack of food/algae for them all. I have a new 20g long and will be getting another around the first. My current tank is a 30g. I'm thinking 2 ottos per tank would be better when it comes to food/algae supply. What's your experience with ottos? Also to be moved to a 20g long tank will be the 4 inch Albino Gold Dojo because he/she keeps pulling up my Anacharis plants and java moss. But i like live plants, so i'm not sure what to do there.