01-17-2010, 09:00 AM
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You said there are 8 54w bulbs, and thats t5 ratings not t8, two 54w t8s would be more than enough for a 75g tank. Running two of the t5s without CO2 would probably be screaming for algea. If you don't plan on saltwater, why not sell the t5 fixture (since it would be a waste) and buy some other fixture that would suit you better for freshwater. PS plants need ~10 hours of darkness at night.
And probably make some money in the process
Last edited by mrdemin; 01-17-2010 at 09:05 AM..