I have a 100 gallon set up that basically exept for the fish and salt, everything was given to me, tank, filters, live rock etc. I built the base for $30. I will post pics once it is really esablished. I do a 5-7gal change about once a month. My tiny starfish that came on the live rock, the scooter blenny and coral banded shrimp seem to keep the tank clean.