When I moved mine into my 24" tank I had to upgrade from 250w to 400w MH and that just seems to be enough. When the bulbs start getting older it starts to roam.
The sting from them is fairly strong, it has killed many of my corals over the years from touching them when roaming. Some of the more resilient corals do recover but not all. Worse yet is if it gets cough in a power head roaming it releases a toxin that will kill your fish, so be careful.
Thats just my experiences that I have had with mine for the last 5 years, some others may have had a easier time of it.
You should be OK just keep that in mind, you may have to move it closer to the light or upgrade your lighting.
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