How big is the 2x400 unit?
Also, this is the unit I was looking at on ebay
http://cgi.ebay.com/60-Metal-Halide-250-T5-HO-Aquarium-Light-Lunars-NEW_W0QQitemZ170441064647QQihZ007QQcategoryZ46314Q QcmdZViewItemQQ_trksidZp3286.m7QQ_trkparmsZalgo%3D LVI%26itu%3DUCI%26otn%3D4%26ps%3D63%26clkid%3D7711 656521745857106[/url]
Anyone know anything about this? Is it worth it? Seems pretty cheap
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