Hi there! I'm new to all of this, I've got three wild type axys, sushi, flat eric and lancelot, I've had them little over a month now and I'm having similar problems, but mine don't look anything like the pictures posted, my two older ones are dark wild coloured for a few days tjhen are very light tan with very red gills for a few days, mostly nights, they don't look sick, have no fungus, I check the water often, they are eating perfectly fine and never fight with each other and are super active, it doesn't seem to affect them in the slightest, but no idea what causes it, I've asked around a couple of aquariums and pet shops and they don't know either, I'm not worried as my axys are healthy as always would just be curious to what causes it, all three are from the same parents I believe but lancelot stays the same colour all of the time, though he's a few months younger, I was wondering if its when they come into sexual maturity?