You can build a stainless steel frame to mount the floodlight directly over the tank/FGT.
Make sure the floodlight you are getting is IP65 of good quality. I have seen floodlight with IP65 with water in it, the LED chip and driver are gone case.
A 30W floodlight should be sufficient since you are using it at about 2-3m height. It is about >3000 lm and >200lx at 120 degree angle.
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