what is better a refugium or a sump???????

[Troy F]

They have completely different uses or can be combined in the same unit but it would be hard to say which is better??? A sump is handy for hiding away your gear, extra water volume etc.. A refugium is to provide an area for critters to grow without the predation of your main tank as well as possibly grow macroalgae in the hopes of lowering nutrient levels.

PS: Hit your cap lock button.