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I have a 65 reef (mostly SPS) with no sump and no problem; certinly not a requirement at all. However, my next setup will have a sump for a lot of reasons but none of them are for water quality. (mostly to get stuff out of my tank..heaters, HOB skimmer, HOB refug, etc)
Might be ok but I would keep the Acro's at the top of the tank with that lighting.
Good luck!
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