I have a 225g (72x30wx24) mixed reef tank. For flow I have 2x MP40's, Korallia 4, MaxiJet 1200 with upgrade and Reeflo Barracuda return pump. All told, about 50x turnover. You could go with less flow if keeping only softies and LPS. For lighting, I would recommend a minimun of 3x250W MH with T5's for actinics; 3x400W MH would be better if keeping SPS. Mine has aprox. 5 watts per gallon which I consider too low for SPS, so I have all SPS high on the rockwork.
Hope this helps you a little.
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225g reef
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