Are there any freshwater sump experts on here. Looking to design a sump for my 6 foot peacock tank and wanted to know if there is a difference on if the water flows up or down in the section with biological media. Has anyone here used a refugium?
That really depends on the type of media. Obviously you can't run a trickle filter backwards... but submerged media, that really wouldn't matter I don't think-others may disagree. I use kaldnes k1 in a moving bed and it doesn't really matter in my application either.
As far as a refugium, I have never used one in a FW application. I have never really understood the benefits of it. But I am curious as to what you have in mind for yours.