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A six bulbs T5 fixture, a 175-250w x2 MH fixture with or without supplemental T5s or 2 LED modules would be your options on a 75.
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took this from marine depotAquablue Special: Combines the properties of a full-spectrum bulb with an elevated blue color peak producing a bulb with an approximate color temperature of 15000K.
Blue Plus: Combines the properties of a blue bulb (approximately 460nm) with an actinic bulb (approximately 420nm) producing an intense blue light with high PAR numbers and a light spectrum that encourages both bluing in SPS corals and fluorescence in capable corals.
Coral Plus:Combines the properties of a Blue Plus (~50%) + Aquablue Special (~40%) + Purple Plus (~10%) producing a bulb with an approximate color temperature of 15000K+. Appears cool, crisp white to the eye.
Purple Plus: Combines the properties of a full spectrum bulb with strong red and blue components producing a bulb with excellent color-rendition that works very well for bringing out the pinks, purples and reds in an aquarium.
True Actinic: Produces a violet-blue light that is designed to maximize fluorescence in capable corals and make livestock colors pop.