Mixing LED Colours on custom fixture

[Ron99]

Your PAR for coral growth will come from your blue and white so you'll want some optics on them. 80 or 90 degree with good overlap to get your colour blending as well as even lighting.

I would use the other coloured ones without any secondary optics as they will be just for visual impact rather than coral growth. That way you won't have any disco ball effect from separate colours being focussed in too narrow a way.