Custom LED lighting advice. Input please?

[GoFish]

Another one to consider is the Evergrow IT5012.
It's 1/2" wider and 1" thinner than the Malibu and has 6 colour channels instead of 4. No idea on price sorry. When talking with Evergrow they're quick to reply at first but when they realize you aren't a business/going to order a 10 fixture minimum for custom colour layouts communication kinda dies off. You MAY be able to utilize Reefsupplies to help you get one instead of dealing with China yourself

If you do decide on a light that has 3w diodes and they won't customize them for you I have a handful of spare diodes in several different colours that could easily be soldered (UV, Cyan, Pink, royal blue)