Thanks for all of that info. This helps a lot. I have been going back and forth on trying to find the best AIO for my needs. I am now leaning towards the waterbox lol It may have a bit more space to work with. I just want to make sure I have more options for setting things up when the time comes.IMO the chambers aren't good for much other than your media baskets, heater, and your ATO. "intank" makes a great basket for these tanks. I use a sicce 1.5 to feed the skimmer and that barely fits in the second chamber. A 3.0 fits barely into the main center chamber as the return. Id like to start using a DC pump in the future but I haven't landed on one yet. You could do a chaeto fuge in one of the second chambers for sure though however I found I ran out of room pretty quick once I wanted to get probes and stuff in there, dosing tubes etc, really jammed up the room for a heater and ATO which I run (2) sensors plus a third high level sensor. To me this is why trying to fit a skimmer in the AIO chamber was out of the question even if I found one that did work for me
I just would have preferred IM because of their quality. I know nothing about waterbox, but they seem solid.