I use 3 165 watt black boxes on my 90..
The center brace was broken when I got the tank.. so I have a home made center brace that doesn't obstruct much light at all
Currently my lights are set up as follows
- l -
Each line is a light
It gives me some pretty amazing coverage across the entire tank
My 90 is a 4ft tank as well
Though the center light being sideways like that puts alot of light into my overflow.. and that has caused it to grow a bit of gha in there.. almost like an unintentional fuge so to speak
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