Greetings. Great forum!! I've been dabbleing in FW tanks for a few years. I've had my 46g up and running for the past two years. Lightly planted (a couple Hornworts, a couple Banana plants and a little floating not sure what it is.) I have 5 corries, 5 Harlequin Rasboras, 4 neon tetras, 3 Blackskirts, 3 Red Velvet swords. I always had HOB filters and had pretty good luck with them. During my last water change and impeller inspection I dropped my emperor 400 and cracked it. I'd been hedging toward a change to a cannister filter for a whileso I went to my local lfs and picked up an Eheim ecco 2236. Very easy to set up, dead quiet, and nice clear water. I've already made a short story long but my question is should I add a small HOB for aeration or something else or is the cannister enough by itself?