Super rough and simple but here we go. Just something basic like this. And yes, I was actually concerned about back pressure but I do not want too much flow through the refugium anyways. I have seen this done before but I do not know how it worked exactly. It does seem like it would be hard to get flow moving properly through the refugium.
Like I said before though, because of space the second herbie would be hard to do. plus I do not see how it will work without much of the height difference. I may be missing something though!
