04-04-2009, 05:11 PM
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Yes it will work great if built properly. For a simple one-screen design, use two of these lighting units on each side:
(i.e., four total units, eight total bulbs).
Keep the lights no more than 2" from the screen (mine are 1"). Here are the replacement bulbs:
The reason you need the replacement bulbs is that the unit comes with two bulbs: 10K and Actinic. But you don't want the actinic, since we are not lighting corals, and even the 10K are too blue for algae. So you replace them with "plant-grow" pink bulbs.
I'm assuming you will be using a slot in the pipe, and that the screen will go into it. You are correct that you need 840 gph for the screen, so put a gate valve (not a ball valve) on the 1200 mag pump. Keeping the pump high in the tank is a good safety feature. Of course if you let the water in the tank get too low, there are going to be a million bubbles created. But at least if any plumping breaks, it can only pump out a little bit before the pump is out of the water.
Note that the lighting will be extrememly bright, so make sure your hood is completely sealed to keep the light in. And the safest way to build the hood is to make is from acrylic, in order to keep all water off of the lights. Then you can build a decorative covering around the acrylic.
On your "hose out to tank", make sure that the hose/hole comes out the bottom of the scrubber, and not the side. This will keep the water level low in the scrubber, which will expose more of the screen. Also, if possible, put the hole in the center instead of the end. This will further help get as much water out as possible from both ends.
On the "hose into scrubber", make sure to put a union on the inside, so the pipe can be removed easily.
Biggest decision: How to hold the screen in the pipe. Tie-wraps, or T-shaped slides that insert from the end, or giant C-clamps that wrap around the pipe, etc, are all possible. It just needs to be easy to get the screen (and the pipe) out for cleaning. Since you have the advantage of being able to easily reach your scrubber, you should just place a hinge on the top of the scrubber, so you can just tilt it out of the way to remove the pipe and screen.