I’m not quite sure what a refugium and chaeto is and wow yeah I need more then. I wanted some emerald crabs but heard they like to snack on some coral but don’t know which ones they would eat cuz I only have Kenya trees for soft corals the rest are hardIf you dont have a refugium with chaeto or an algae scrubber, you will be facing an uphill battle with algae in the tank. Also, bumblebee snails dont do much. You need way more Astraea or turbo snails. I needed like 6 to clean up a 20 gallon.