You'd be much better of with a 6 bulb fixture, which will fit nicely, over a 75. I had a 6 bulb Sunlight Supply, Tek5 fixture, over a 75, that was predominately SPS, for 3 years. 4 bulbs just won't really be enough.
You'd be much better of with a 6 bulb fixture, which will fit nicely, over a 75. I had a 6 bulb Sunlight Supply, Tek5 fixture, over a 75, that was predominately SPS, for 3 years. 4 bulbs just won't really be enough.
I dont think the depth makes a big difference, I think it would affect the coverage front to back. The area cover by the first 3 bulbs wont get much PAR from the 4th+ bulbs and viceversa.
I think 4 bulbs in a 75g SPS is doable but you'll get more coverage and more bulbs to recreate a better color for aesthetics.
i agree aleast 6. i have a 8 bulb over my 90
5 ati blue +
1 6500k ge
1 12k ati
1 fuji purple
i have good growth and can grow sps on sandbed. 8 bulb mite be a little over kill. i think you should deffintly go for more than a 4 bulb IMO
I just switched from a 4 bulb tek to a 7 bulb aquatinics constellation on my 75. I was able to keep and grow SPS just fine under the tek, but like everyone has said, I would do at least 6 bulbs. The growth is unreal with the new fixture.
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