Im looking at starting to run a hang-on fuge very soon for my 25 gallon tank. It looks like the fuge will be 24"X12"X12" Hang on style.

My question, is what do you put in it? Do you need sand, live rock, cleanup crew, etc? Ive also seen a "mud" for fuges. Is this better?

I plan to hopefully grow some macro algae and pods in the fuge.

Can I put any of my equipment in the fuge? i.e. skimmer, heater, filter, etc?

Thanks for the help.