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I only run 1 400 watt 14K MH.
My friend runs a 250watt 14k on his tank which is the same depth, but he uses NO actinic tubes as well. Some of his corals are much more colorful than mine. There's a lot more to it though, suppliments, water changes, bio load etc. that can also play as variables in our cases.
What needs to be done is a controlled experiment with the same corals in the same tank, with and without actinics.
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THE BARQUARIUM:
55 gallon cube - 50 lbs LR - ASM G3 skimmer - 30 Gallon sump - 22 Gallon refugium / frag tank - 4x 24 watt HO T5's - Mag 9.5 return - Pin Point PH monitor - 400 watt XM 20K MH in Lumenarc reflector - Dual stage GFO/NO3 media reactor - 6 stage RODI auto top up -Wavemaster Pro running 3 Koralia 2's.
Fully stocked with fish, corals and usually some fine scotch
http://www.canreef.com/vbulletin/showthread.php?t=55041
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