Tank was setup in January 2017, been doing water changes once a week and went to once a month. I dose Alk everyday and MB7 once to twice a week. Don’t run any filter socks only a protein skimmer, GFO Reactor. I have good flow in the tank and never had any issues before. The cyano is taking over corals and thinking I need to go back to once a week water changes. Maybe I should add more snails?