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#1
10-31-2011, 01:59 PM
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ATO in my opinion is absolutely mandatory. Get one... you'll be so glad that you did.
On another note, I can't imagine having a top on my tank. Wouldn't that kill your PAR?
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-Murdoch 160 gallon Reef, almost all SPS, a few LPS, small handfull of Zoas, and 5 clams. LOVING the upgrade (now that most of the work is done!) My tank Journal: http://www.canreef.com/vbulletin/showthread.php?t=75924 
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#2
10-31-2011, 02:14 PM
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Glass tops can keep heat in which may be an issue. They will also require regular cleaning. The best thing I ever did for my tank was install an ATO. I haven't had to top off the tank in a year. Mine is plumbed into my household water supply (with appropriate safety stages). Previously, I used 5g jugs attached to a float valve.
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Brad
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#3
10-31-2011, 02:53 PM
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When I ran my tank open I lost way too much water throughout the day that the return pump would start sucking air. About a gallon a day. After putting glass tops on I lose about 2 litres tops.
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 314 gallon Drop Off Reef tank. 150 gallon sump. Bean Animal Overflow. Various Tangs, Angels, Triggers, Inverts, Corals, etc. http://www.canreef.com/vbulletin/showthread.php?t=80379
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