I have a small desjardani, med blue hippo, med scopas, med vlamingii, and large blonde naso. They are fine. My scopas is the biggest bully. The blonde naso started to become territorial when I introduced my vlamingii today. It would stay in its zone and peck at the vlamingii when it swims by.
Scopas was in first, then desjardani, then blue hippo and blonde naso together. Lastly the vlamingii.
Tank is 100g (48x24x20)