Wet/dry filter,sump,refugium???

[timmy]

What's the diff. between a Wet/dry filter,sump,refugium and their purpose?? Do I still have to siphon the gravel to get of the dirt off or one of these would do it for me?? I have a fish only SW tank.


Thankx!

 

[darb2]

go to the articles section and look for sumps explained and fuges.