that
will work. its working in my 55g, and the only difference between the 75, and 55 is width.
here they are when i got them ( 11-29-08 ):
here they are 1 week ago:
under 260W Coralife PC fixture, with 130W 10oook, 130W Actinic. the second pic was actinic only, to show them at their best.