Orange Montipora capricornis is one of the most tolerant SPS corals you can have IME. Not lecturing because, its your money. But, I would not buy any more SPS until you've invested in test kits for pH, calcium, and alkalinity. You should also think about getting a magnesium kit and be sure you have a refractometer, not one of those unreliable junky swing arm salinity meters.
IME caps can have their color muted by dips in specific gravity, build up of nitrates, or swings in alkalinity, like Cardiff said. The main thing to consider with SPS is stability. If you discover what the problem is, be sure to correct it slowly over time. Tossing an already stressed coral into another tank will create further stress IMO.
Not sure how long your tank has been set up or how stable it is but you need to monitor your parameters regularly. Not owning test kits at all is not a good start if you plan on keeping SPS. Once you get them, consistency and attention to detail will lead to success. Best of luck :thumbsup: