I have had these Rummy Nose Tetras for a few months now and recently they have developed green spots over their head. Two of them have more of a green line from the top of the head till their mid section.
Is this normal or have they caught some sort of disease? Also, upon further examination, it sort of seems as if my Neon Tetras have a little green to them as well. (Although I might be seeing things since the light reflects off weird.) I figure that if its normal for the Rummy then there is probably nothing wrong with the Neons.
I change 30% of the water bi-weekly (as in every two weeks) and have HOB Aquaclear 70. Water Sprite and Hornwort are the only plants. Water temperature is at a constant 75 degrees. 55 gallon tank.