I made a temporary diverter from my inflow pipe, and I'm getting pretty good flow to the planter. In fact everything is going through the planter, as I have blocked off my secondary (circulation) feed.
I bought quite a bunch of pothos. This 30 has a big hole in the lid so I just stuffed The Roots right through it and rested them on some fake plants.
This guy may decide to chew on the roots. I don't know if he will like the pothos but he is normally murder on live plants.
Looks like you are using a grow light of some sort.
This is my cheapie Kmart grow light. I got this on sale for $14 about a year ago.
Now K-Mart is no more . . .
I used a couple of bent wires and some rubber bands to suspend it. The wires just plug through some holes I drilled in the flower boxes. If you misalign the holes slightly, you get a good friction fit and they stay put.