Thinking on adding a sump or refugium

[Claudia]

Hi all, I have my sw tank going, is been doing great and i have been thinking on adding a sump or refugium now. I have a phospate reactor, an ac, and a skimmer. i dont mind anything in there but the phospate reactor, doesnt look nice lol
I need ideas as i have no idea what or how to do this, my tank is not drill and the stand doesnt have holes at all but the back of the stand is open so i can make the connections there, the back of the tank is black so nothing would b seen.

Thanks in advance