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Originally Posted by RED_FIRE
its a 55g cylinder tank i was asking if the 400w mh was to much for the tank
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Again, depends on what you want to keep. SPS and clams would like that light, most other stuff, not so much. And heat might be a concern, depending on your hood style. I have 2 400w on my 75g, so you would be ok, depending on what you want to keep.