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Actually, the 2 fish in question are the larger of the tank. I suppose there is some light in the room but very little at night. I'm not overly concerned since they appear healthy and all the others...

I have 2 discus tanks (+cardinals & plecos) 55 & 75 gallons. Six fish in the in the large tank 4 - 6 inches. Seven fish 2.5 - 3 inches in the other tank.

Everyone is healthy, 35% water changes...