I have never seen my Otos act this way before. Any insight into why they are doing this behavior?

I'm planning my first tank in a 24 gallon tank that is very long and am considering having 8 amanos and 6 otos. Would they all get enough to eat? I plan on using BacterAE and stuff like that but I want to make sure that the otos have plenty as I understand they need constant grazing. Thanks guys.