good plan. it sounds like the filtration is set for the tank, i guess my other concern (and probably main one) is the crowding...with gars it can keep them in order to an extent, but in most cases it can lead to broken backs pretty quickly with spook-factor. i'm not trying to pick on you or anything as i have definitely kept some gars in crowded conditions in the past, just speaking from my own experience and hoping other avoid the issues. best of luck...i will unfortunately be parting with most of my gars in the very near future (some to a bigger "tank" others in the collection will be re-homed) --
--solomon