Mine is only 20 deep, your not going to get more penetration with 6 bulbs over 4 just more coverage front to back. If you want to keep SPS you will need to keep them high on the rock work no matter which light you go with.
are you running the Tek 4x39 or the Nova 4x39? I am looking at either of these 2 for my 70 Oceanic that I am setting up. Not sure which one to go with yet.
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