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Old 04-07-2011, 04:03 AM   #1
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2 small tanks as one sump

I'm working on a 55 gallon planted freshwater tank. I'm getting it drilled and will be running a sump, hopefully wet/dry and a refugium. The most cost effective way for my situation is to have two 5 gallon tanks drilled and run them both as sumps. Has anyone done this? Are there any problems I'm likely to run in to? I would like to use one tank as a wet/dry and one as a refugium. Any help is appreciated.
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Old 04-07-2011, 10:00 AM   #2
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It's very possible to use two tanks like that. Here's an example: Sump for a 340g reef
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Old 04-07-2011, 10:21 AM   #3
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Use the overflow design that was in the link Jim posted. I had the same thought as you but wanted to use 2 pumps (1 pump in the 1st tank going into the 2nd tank, and then the pump in the 2nd tank returning to the DT). I was warned that there is a high probability of not having synchronized pumps, which could cause flooding.
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Old 04-07-2011, 10:23 AM   #4
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I've definitely seen it done before. Patrick also brings up a good point to consider as well
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Old 04-07-2011, 10:43 AM   #5
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If you are planning on plumbing the two together by drilling and fitting with bulkheads there is a risk of twisting the glass by bumping or accidentally moving one of the tanks and could cause the glass to shatter.
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Old 04-07-2011, 01:55 PM   #6
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Yeah I was going to drill them, should I connect them with rubber hosing instead of PVC to give a little bit of wiggle room? Also would I need a second pump to push the water from the first tank to the second or should I elevate the first slightly so gravity can pull it down to the second? Not sure how to connect the two. And it looks like melev had the refugium first, everywhere else I see the mechanical filters first.
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Old 04-07-2011, 02:19 PM   #7
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Here's how I would attempt it:

- Position the refugium so you can have it flow into the wet/dry under the force of gravity.

- Add a tee to the tank overflow.

- Put a valve on one side of the tee and run that side to the refugium tank. Run the other into the wet/dry. The valve lets you control the refugium flow.

- Pump the water from the wet/dry back to the display tank. This way you've only got pump(s) acting on one leg of the system, minimizing the chance of pump-caused floods.
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Old 04-07-2011, 05:12 PM   #8
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I use 2 sumps,pics are in my profile
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Old 04-07-2011, 05:20 PM   #9
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Does this highly artistic rendition look correct? Would I use 1" holes all around? And do I really need the tee or could i just have the overflow directly into the refugium and then directly into the wet/dry. Also, it seems like this might get messy if the power goes off as the refugium would always be at the overflow height that heads to the second tank. The second tank is only 5 gallons so it would overfill pretty quickly.

Thanks for all the help and suggestions
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Old 04-08-2011, 05:06 AM   #10
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You'd have to add a sock filter or something on the refugium overflow. Also, you wouldn't want the pods from the refugium to get filtered through the media in the wet/dry sump.

How about having the filter first, then the fuge?

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