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The 3 center lights are Metal Halides (MH). You would have to read the bulb or the ballast for them to see how many watts they are and how many K they are. The K value will be the color look of the tank.
I would change 1 bulb a week so the corals will get used to the new intensity.OR.
Change out both and put screening on top of the tank to block out some of the light. Remove a layer (if using more then 1)a week.
Depending on the bulb brand, the 20K will be only a little more blue.
Are you breaking down the 55 and upgrading to the 90?
The 1/10 will bring the 90 down a few degrees. You would either need a smaller pump to run the chiller, or you can T off the 1330 pump with a valve and feed the 1/10 with half the flow.
I was watching this thread to see if you were going to have good success. From my experience and from what I've read, Fuji leathers don't like being fraged.
Sorry to hear this kat.
Chillers are rated by BTU. For laymen like us, they also have a horsepower rating which we understand better.
For a 180gallon tank, a 1/5 horsepower will handle up to 180 gallons. A 1/4 will handle in the 200's. A 1/3 or 1/2 horsepower will handle in the 300 to 350 gallon...