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Sorry to Hi-jack.
I need to replcae my MH bulb soon too. I have a plain old magnetic 400 watt balast, and I want the bluest bulb I can get for it. Any suggestions?
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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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