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I have a 29 gallon salt water reef tank set up right now. It has been going for about four months now. I want to change the filter but I need to know which one would be better for this size tank. A penguin biowheel or an emperor? And which size? Can anyone help me out on here? Thank you.

I have a 29 gallon salt water reef tank set up right now. It has been going for about four months now. I want to change the filter but I need to know which one would be better for this size tank. A penguin biowheel or an emperor? And which size? Can anyone help me out on here? Thank you.