macman, You say you have seen these fish in smaller tanks... Do you know how long they were in the tanks? Anyone can keep a fish short term, my goal and others is to keep them long term. And IMO
and others you need a well established tank with LR
and a refugium to help out if you run less Lr
and have a smaller tank.
I listened to a LFS
and tossed in a manderin in my tank that had 125lbs of LR
, my problem was the tank was not mature and he ate through the pods
in no time and starved to death in less then a year.
I am giving advise based on my experiance and IMO
if you do not have enough LR
you should think about getting a fuge to help out with pod population. Not all fish will eat prepaired foods.. I have a new manderin now and she never touches prepaired foods.