So in the near future I'll have a 20 gallon set up. To be honest with you I don't plan on having a sump, refugium, or skimmer. Will have a slow/long cycle, power heads, and frequent water changes. I've done this successfully on a 50 gallon years ago. I'm a little rusty but should I have some kind of HOB filter for oxygen(or another reason I can't think of), or will the live rock be good enough?


