Originally Posted by
privatejoker
http:///forum/post/2708368
A fuge is two different things. One is to put sick/picked on fish in. It has no macro algae or sand bed.
The other is where you put a deep sand bed and macro algae and its used to get rid of nutrients, grow copods, and other little critters.
I call the former a "hospital tank" and the latter a fuge.
The difference is that you do not plumb a hospital tank in with your main system. This keeps the medications out of the system and in your sick fish.
A fuge is plumbed in with your existing system and it gives more biofiltration capacity to your tank. A fuge can have live rock, macro algae, mangroves or just about anything you can think of that will help filter the water. The purpose of a fuge is to keep these sensitive algae away from your fish so that they don't get eaten, hence the name REFUGium. It provides refuge for sensitive organisms.