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#1
05-17-2012, 05:12 PM
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I do a daily water change on my 120 reef and love it. I use pump from my basement, controlled by an Aqua jr to bring up the new water up for 1 min. In the sump I have a float switch on a timer and its on for about 15min a day, just in case of a power outage. My one problem was setting the float switch right. I solved this by using a magnetic probe holder to hold the float switch, easy to a just.
On a smaller tank I would use a dosing pumps to add and remove water. I would add the water first and then when its done, have the pump remove the water. I check my salinity about once very week or two.
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120 G sps reef, looking to build bigger. 
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#2
05-17-2012, 05:24 PM
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Hmmm, 20% after change every 2 weeks is only 5 gallons. Seems like a lot of extra work and expense you're considering for such a small tank.
I would only consider an automated system for a tank over 100 gals
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Last tank was 210 reef with 90 gal sump 120 , lps. 2xKessil A350W Tuna Blues, 2xvortech mp40 for flow,aqualogic 1/4 hp chiller, 160 lbs live rock. sohal, , pair of percs,flame dotty back , royal gramma, pair of black percs, niger trigger, mandarin 55 corner bowfront freshwater, African cichlids kessil a350 30 gal 36x36 coffee table fish tank. 3 red ear sliders. 5.5 gal nano, live rock, arrow crab, baby perc, firefish.
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#3
05-18-2012, 09:44 PM
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If you're only looking at changing 1/2g per day (less than 2 liters) I would just go to Walmart and buy (2) 2000ml liquid measuring cups. One scoop of dirty water out of the tank and one scoop of new water in. Done in 30 seconds with no chance of failure.
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