I think I'm going to restate my "vote"...
My frag tank is drilled and started running on 2 RFG'S that
@tbrown3589 linked above. This was the plan from the beginning.
RFG'S require a certain amount of flow through them to actually work. In my case it was 300 GPH each. That means I need it to be running 600 GPH through a 30 gallon tank.
Being that I primarily house mushrooms and softies down there, that kind of turnover created too much flow. No matter what I did, mushrooms were not laying out well.
The spray bar was a great solution for me, given my tank size and desired livestock following
@najer inspiration.
Now that I am keeping some acro in there, I'll be adding a small hygger pulse pump set to only come on at night and blast the acro while they are actively feeding, and the softies are shrunken and more protected.