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oskrcg 
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Joined: April 28 2009
Location: Salt Lake City
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 Topic: NEW WITH MH
Posted: November 04 2009 at 12:12am |
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Hi, I had power compact on my 55g tank, but i got 2 x 175w 15000K MH, I just want to know how long they should be on per day?
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I'm new in salt water aquariums
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Mike Savage
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Joined: July 15 2005
Location: Murray
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Posted: November 04 2009 at 6:43am |
Most corals need about 8 hours a day. Most people like to run the lights 8-12 hours for more growth and longer viewing.
Mike
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chk4tix
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Joined: April 06 2007
Location: Texas
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Posted: November 04 2009 at 6:56am |
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If you just got the mh's, I would recommend starting out with 2-4 hours a day and slowly work the time up to the full time you want the lights on. This will help insure you dont shock the corals with light and bleach or kill them.
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Original Crappy Reef Club Member #2
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Mark Peterson
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Joined: June 19 2002
Location: Murray
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Posted: November 04 2009 at 8:13am |
Definitely  two weeks of acclimation to new brighter lights.
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Reefkeeping Tips, & quick, easy setup tricks:www.utahreefs.com/forum/forum_posts.asp?TID=9244 Pay it forward - become a paid WMAS member 
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Crzyfshguy
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Joined: August 23 2007
Location: Bountiful
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Posted: November 04 2009 at 2:17pm |
hell just leave them on 24 hours a day, stuff should grow AWESOME!  I run my MH 3-4 hours a day and my corals are still slowly growing, If you can afford to run them 12 hours, I am sure your corals would love you for it. I run a 24W T-5 for 8 hours or so though.
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45G w/ leds
15G sump
MP10es
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AvesSaltGuy
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Joined: October 27 2009
Location: Salt Lake City
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Posted: November 04 2009 at 2:28pm |
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lol @ Crazy - no sleep for corals or fish! :)
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Michael - 120G Reef Acans, Pom Poms, Zoas... Clowns, a firefish, and a coral beauty -purple tang, sailfin desjardinii, Filtration - sump, protein skimmer, UV sterilizer, 2 Koralias, refugium.
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