Tank is looking great!
If you mean by blue, blue LEDs, that may be tricky. Most cameras have a hard time balancing out the really blue colours and makes taking photos and video with the blues on, or only blues on, very tricky. Almost all cameras nowadays let you custom white balance, which helps, but it is still tricky to nail it. I can't speak too much for the point and shoots these days for reef photography, but they are getting insanely good in terms of picture quality, and many have detachable lenses for different applications much like a DSLR. DSLRs are more bulky and expensive, but they do typically allow a great amount of freedom in the white balancing department for both video and stills. You can use presets, or use the custom feature, which will get you very close. Using the WB shift feature, you can usually get even closer (at least on Canon bodies anyway). I would decide what your use for the camera will be primarily and then go from there.
