I got a set of the 2k's as well, im just waiting on my tank to get here. Like you i didnt want the bulk of the bigger ones especially since my tank is only 16" deep. I have a friend that runs them on his frag tank and doesnt have any problems. He has them set directly across from each other on a bare bottom tank and gets really good flow.I will have sand in mine so im sure i wont be able to run them at full power but only time will tell. They are very quiet, so much that the skimmer makes it so you cant hear them at all when its running. Same maintenance as other gyres when it comes to cleaning and due to the length of the blade impeller it does take a few minutes more than your traditional powerheads. A bucket of citric acid to submerge them in works great for this. hope this helps.