waterbox 25 build

I am setting up a waterbox 25 peninsula and was just wondering where most people place the power head? I've seen some middle of tank; magnet in middle chamber and some with it right under the return nozzle. Also was wondering what media goes in what chamber. Thanks

Hello all! More so just doing this for fun feel free to follow along. Over the next few months I’m going to be actively working on building a dream mini tank in my apartment. My end goal is to make it a mostly sps tank with a few softies or hammers to fill in gaps. Eventually the long term...