Personally, the 210. The 125 is not bad, but its really narrow, 17" You'll find, once you add rock, theres no swimming room. I'd only use a narrow tank for like a room devider, peninsula style. And even then. My 150 is 5'x2'x2'. I 20" is as narrow as I would personaly go.
I'd imagine the 210 is 6' too. I was mistaken, thought you said 7' long tank. not 72"(6')
the 125 will take the same MH as the 210 to light, but less T5 due to the width. With MH, you'll have more spillover on the 125
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Dan Pesonen
Umm, a tank or 5
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