Went to check on my tank last night and two of my three black moores have one cloudy eye.

Unfortunately I haven't been about to check the water chemistry yet. But I am 4 weeks into the set up of a new tank, water went murky last week as well.

Any advice would be appreciated.

Please answer as much of the questions above as you can. Usually cloudy eyes will clear up with water changes. You need to get a sample of the tank water to the fish store for them to test as newly cycling tanks can be tough on goldfish. The cloudy tank would have been a bacterial bloom which is very common. It may be a nitrite spike thats causing a bit of stress.
Need to know more info though.

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