Okay, through lots of trial and error, and learning A LOT about this...
I finally put together my first ATS.
I had a big sump box. I ended up taking out all the built in baffles and walls used to hold bioballs or whatever, and ran the PVC across.
My original plan was to have my waterfall come out of the refug, and drain into the tank. But now it's built INTO my refug. And I don't regret it, especially since I put black cloroplast underneath the refug and blocked out a LOT of the pink lighting - which otherwise would have been igniting my tank with ultra pink light :P
I still need to redo my waterfall pipe. I have a 3/16 blade on a table saw, someone said 1/8 (floyd said it I think) would be best. I might try the 3/16 anyway.
My screen is 16(width)x12(height) inches.
My water shields are plexiglass/acrylic that I heated into a U type shape, the weight of it keeps it on the LEDs for now. The plexiglass isn't getting wet but it's a safeguard and was fun to mold it into shape simply warming it with my electric open face stove lol.
If this works, I plan on adding 2 more heat sink panels of the same size, 1 to each side, and doubling up on LEDs.
Here's some pics:
My LED timer is set to 19 on 5hrs off, at least until growth starts. Then I think I heard do 17/7 (on/off)
Input is more than welcome on anything, it's just a trial and I went into this knowing my first won't be perfect.