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#1
02-14-2010, 12:19 AM
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hey there Brett why not go with a 400 2 over the tank on a lumenarc reflector.
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180 starfire front, LPS, millipora Doesn't matter how much you have been reading until you take the plunge. You don't know as much as you think. 
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#2
02-14-2010, 01:01 AM
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Won't a 400 10k fry my tank? It's only 20" high?
Based on the numbers I'd guess the 250 would be a lot of light. I'm also thinking it would take even more blue t5s to overcome the 10k to give me an overall subtle blue color.
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#3
02-14-2010, 01:06 AM
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I run a 400SE 14,000k with only 16" no problem.
__________________
150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller 180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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#5
02-14-2010, 01:32 AM
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i would go with a 20-14 K Brett and 15 " is nothing for a 20" tank.
__________________
180 starfire front, LPS, millipora Doesn't matter how much you have been reading until you take the plunge. You don't know as much as you think.
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#6
02-14-2010, 01:41 AM
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I ran XM10Ks on M80s for a over a year. White with the barest hint of yellow. I wouldn't have run them without actinic supplementation but I like the bluer look personally. They are truly PAR monsters, though, on an M80. I would suggest a slow adaptation period to prevent bleaching.
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#7
02-14-2010, 01:54 AM
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I'm lighting a 29" depth and the light has no problem keeping the bottom well lit so It would be like you having the lights 18" above the water on your 20" tank....I don't think you'll have any problems lighting the whole tank with one bulb from that height
hmmm, from that height above the tank your whole house will be well lit 
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