The niches come with white, grey, dark grey, blue, tan and black colored trim rings match your interior finish. The rest of the niche isn't visible after the light is installed.
The lights will need a relay. One relay can run all of the lights as long as you are ok with them being the same colors. If you want different colors at the same time/independent control then that will require a relay for each zone.
The bubbler will be a feature circuit assigned to the pump so no relay necessary.
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