pipermurphy
Aquarium Advice Freak
Okay, I am confused on a couple of items. On an earlier post I had I was told to remove the bio-balls from my wet/dry and make it a sump. Done that. Now I have tried looking through old posts and am confused on what is a sump and a refugium? anywhere I can get more info?
Also, on my overflow there are 2 holes one is used to my sump what should the other one be used for?
Also, on my overflow there are 2 holes one is used to my sump what should the other one be used for?