Amnagrla

I have 3 otos... I got them from the same store at the same time. 2 of the otos are huge! They've really grown since I got them.. with the most adorable fat belly. However, there is one that hasn't grown at all. It's so tiny still. I tend to chalk it up to maybe he/she is just younger... but does anyone have any info or experience with something like this? I just want to make sure Ned is okay.

0morrokh

Are they the same species? You can usually tell by the pattern of black on their caudal fins. Different species have different patterns of stripes/spots. Many Oto shipments contain several different species, and some may be slightly larger than others or possibly have different growth rates. If they're the same species, I'm not sure why they would be different sizes.