Whats the difference between a marine fish-only and a marine coral reef setup?
There are many differences between the two; live coral is more sensitive to water quality so therefore a reef system should house fewer fish than a fish-only system. Coral also feeds predominantly on light, so lighting generally needs to be of a higher spectrum. Water quality is paramount to the health and wellbeing of a reef system, consequently you will need more equipment than on a fish only system to keep the water quality high.