| Re: 75 Gal with T5 lights - how many bulbs? If you are going with the Tek fixture (great choice) I would go with 6 bulbs,.. only if you are going to use allot of "True Atinics" would I consider the 8 bulb fixture.
I have a tank with the same footprint as yours, but it's only 12" wide rather than 18,.. (mine's a 50G) I used the 4 bulb retro and was able to keep SPS quite happy.
Whiskey
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