4x54w T5's is a fairly common lighting arrangement for a 75g; the key, as John said, is to not be too eager about turning the lights on "full throttle" early on. After your tank is more established, you can adjust the photoperiod (extend the time of the noon burst) to best suit your needs; if you're trying to grow more light-needy species like HC, 2x54w t5's will simply not meet lighting requirements. If you were not injecting CO2, 4x54w would give you a nice algae farm, but make it hell to keep healthy plants. I'll be running 4x54w t5's over my 90g and am confident i can grow anything...
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