Need some advise please...I'm about ready to setup my new refugium, it's going to contain for now some mineral mud and live rock but I will be adding some algae in a few weeks. Can I just set it up, plug it in and have it start pumping water in and out of my exisiting tank without to many issues? I'm sorta worried about creating a new cycle or something to that affect. The rock i'm using is fully cured, the tank has been running for about 4 months now. Is it ok to add a refugium after a tank has already been established such as mine?