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Old 05-10-2012, 05:43 PM   #61
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The slot is just thick enough to fit the screen in without to much difficulty . I used a dremel cutting wheel . Yes it is fed from one half of my overflow . The water is even across the screen and the full screen is getting wet . It only burps out at the end of the screen. I attached a video when I pan to the left side or the end of the screen I pause . If you look at the top left you will see it burp out of there. I can get exact thickness of everything after work.Thanks


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Old 05-10-2012, 06:06 PM   #62
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Your flow is way, way too low. In the video it's just dribbling off the screen. That's problem #1 that I see, that's what is causing the streaking also.

As far as the bubble, it looks more like the water is dripping off in that area, could be that the pipe is not level and as the water builds up a little then it pools and runs out in that area. Adding a gasket around the pipe will stop it from 'escaping' but I think you have bigger problems:

You want 35 GPH per inch of screen width, basically a sheet of water running down both sides of the screen, covering the entire screen, and you should have a solid sheet of water coming off the bottom of the screen.

I can't tell from the video, but you need to realy rough that screen up if it is not already, or else it won't hold algae very well.

Also review the summary posts starting with #33. I haven't looked at your tank setup, but your screen appears to be vastly oversized. The new feeding guideline is 12 sq in of screen for each cube of food fed per day. Your screen looks like it is something like 16" wide and 12" tall which is large enough (if working right) for 16 cubes of food per day. Unless you're feeding at least half of that, and unless it's lit properly with the right flow and screen roughness, it'll never work quite right.

Bigger is not better when it comes to scrubbers. Size according to feeding, get your flow and roughness right, and provide at least 1W per sq in of screen (LxW) and as much as 2W (split between each side).

Example if you feed 2 cubes/day then you want 24 sq in of screen (4x6) with minimum 12W on each side, or as much as 24W on each side.

If you have the higher wattage, you can run the lights less hours as long as you have a mature screen and all of the light hits the screen (good reflectors or LEDs)
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Old 05-10-2012, 06:37 PM   #63
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Ok first thank you for the detailed responses you are most helpful. The screen is 18 by 12 and it is very rough I made sure I was only doing that once. It is a 180 gallon with a porc puffer , emperor angel and zebra lion . The puffer is the main reason I made the screen so big since he is a eating machine. I will review the posts you mentioned and hopefully something jumps out at me. It probably has something to do with my slot pipe I would guess. Thanks
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Old 05-10-2012, 07:40 PM   #64
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Adjusted the slot and diverted flow from my overflow to get more flow. 3/4 look good to me the rest of it not so much. Do I still need more flow to get the other part of the screen or is it something else . Thanks.
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Old 05-10-2012, 08:25 PM   #65
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It looks a little better but you really want the water sheeting down the entire screen.

If you can, try to ballpark what you are actually feeding on a daily basis over an average week. Then re-size your screen accordingly. You can probably oversize by about 25% if you want a little safety factor, but don't go over that. And the amount of lighting and the way you do it is also very important. If you can, post a few pics of the overall setup including the lighting, or describe as much as you can.
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Old 05-10-2012, 08:51 PM   #66
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Ok I will have to do a bunch of figuring on the food so I will get to that ASAP. I have two clamp lamps on each side with the cfl bulbs from home depot that you have posted a pic of a few pages back. The overflow is a CPR 1200 gph . One pipe feeds my skimmer section the other I turned into the scrubber. The return pump is 950 gph ( I could get a stronger one giving me more flow if needed) . Here are pics of the setup. I am going to replumb the section between the slot pipe and overflow with less bends to try to squeeze some more gph to the scrubber
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Old 05-11-2012, 06:38 PM   #67
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Major problem there with the lights. They need to be perpendicular to the screen, pointed right at it. Your lights are doing almost nothing.
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Old 05-11-2012, 06:46 PM   #68
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Ok I'll try to make a stand of sorts to get them where they need to be . Is two lamps enough or do I need 2 more?
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Old 05-12-2012, 12:39 PM   #69
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Is this better? There is one on each side. Thanks sooo much Floyd .
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Old 05-18-2012, 03:46 AM   #70
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Quote:
Originally Posted by Floyd R Turbo View Post
Bigger is not better when it comes to scrubbers. Size according to feeding, get your flow and roughness right, and provide at least 1W per sq in of screen (LxW) and as much as 2W (split between each side).
Smaller is better, but not too small. Right? 1 cube is 12sq inches. Ok to do 10 or perhaps even 8sq inches per cube? (not crazy small like 2 or 4 sq inches).
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