The Gen 1 fixture is a fixture meant for the main lighting of a tank not a supplement and no there isnt a way to turn on the blues only.They are ran on 3 different panels,1 plug is to turn on the middle panel and the other plug is for the remaining 2 side panels.Being your tank is a bow front I think the reefbrite would be awesome for you because you can angle the the strip to point to where you want the light to go.Is your setup dimmable? Can you just turn on the Royal Blues?