With that kinda light you should be able to keep anything, I would put croceas up high as you can though, I have a 20gallon standard with a 150 14k viper HQI and I keep croceas and derasas without a problem. I would think you could probably keep a derasa in the sand.
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"Remember remember the fifth of November, the gun powder treason and plot, I know of no reason why the gun powder treason should ever be forgot"
-Guy Fox
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