I just got a used max nano 20 gal. I currently also have a waterbox 25. I have never used a sump before and have no idea if it is working. I have it placed in the back and I have the box on top with the lid. I have the power connected and it is on as I can feel it working. Is there supposed to be water in the box or at least a little bit? It is dry. Like I said, have never had a sump before. I have no problem buying another on or upgrading to something different.

