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Paint reflector in white ?

Even with your current reflector you should have more than enough light.
2 x 39w Odyssea par values (36" fixture)
10.5" (26 cm)130 91 92 85
16" (41cm) - 86 53 63 59.
Not apples to apples comparison but it paints a picture.
Measured in free air.
I assume light face to surface.
thx, in air which means in the water there is way less Par, because light have hard time to get though it right ?
 
No.

2 things though.
1) water and stuff in it starts absorbing the red end if the spectrum. So water will absorb some light in the red spectrum but not much at 12"

2) Due to internal glass reflections and light refraction generally par will be higher than measured in free air where its "spread" is not restricted .
 
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