Well, I've had issues with the 454's, so I'm prone to partially blame them and even more so if all 3 are 454's, but I would also say moving them up was probably not a good move for them either. I'm not sure what your options are for an 18" bulb, but I have to say I'd recommend switching them out for something else, as I've had a lot of bleaching issues with the 454 bulbs when I tried them.
The one that's turning brown could be getting diatom growth on it if it's receding. Move them to the shade and hope for the best.
Also, have you tried raising the fixture up off the tank a bit more to diffuse the bulbs and lessen the color segregation?
The one that's turning brown could be getting diatom growth on it if it's receding. Move them to the shade and hope for the best.
Also, have you tried raising the fixture up off the tank a bit more to diffuse the bulbs and lessen the color segregation?
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