I have a 15g column tank that is heavily planted. Started out with tetras before I realized they need more horizontal space. Currently the tank is stocked with cherry shrimp, one oto, and three neon tetras. I’m getting a few more oto’s and considering taking the tetras back to the LFS, and possibly picking up some chili rasboras or CPD since they seem to do better in smaller footprints. Should I just leave it an oto/shrimp tank or is there sufficient room for nano fish?