Well, cloudy eyes in moors indicate very high toxin levels and your barely changing the water. With all these other fish in there, I can only guess what your parameters read. Please invest in an APi fw master test kit as soon as possible. For now, start changing the water 50% at time daily. Yes, daily. Make sure the new water is temperature matched and properly conditioned.
Bad news is, as his eyes are cloudy, this indicates they have been burned by high ammonia/nitrite/nitrate. We don't know which because you don't know your numbers. Moor's eyes are very sensitive to water parameters, especially ammonia and nitrate (even at nitrate levels of 10ppm), and they are easily chemically burned. This is not treatable and he likely is quite visually impaired (if not completely blind). What you can prevent is further eye trauma and the possibility of infection with constant water changes until you can address your stocking situation and place the rest of the tropicals elsewhere. He will need to be kept in this tank by himself with no sharp objects or anywhere he can get tangled with religious wcs. Please ask if you have questions!
