What should i put in the refugium? Do I need sand? How much live rock? And what type of algae? And a heater? Light?
Not necessarily assuming that the water from the main tank has a heater but just too make the main tank look better is to just hide it in the refugium and hermit crabs and snails not needed but u can trow it in there but they might eat the algae so it not recommended and add live rock because reefs are all about filtrationAlso is a heater needed?