Okay, built my refugium and now will be needing a pump. My questions are: 1) What flow rate do I need to look at for this 30 gallon refugium, I know it is not supposed to be too high and 2) I have read that you don't want one that has an impeller due to the chopping up of critters that might be travelling to the tank, so what model does not have an impeller?
Thanks for all advice.
Thanks for all advice.