Not too much info here, but here is their site, if those are the ones you were talking about:
http://www.marineland.com/sites/Marineland/products/productdetail.aspx?id=2054&cid=3600&mid=3228">http://www.marineland.com/sites/Marineland/products/productdetail.aspx?id=2054&cid=3600&mid=3228</a>
I'd go with the 72 X 36 X 27 in 300 gal :eek: