Managuense from less than an inch to up to 7" will often turn black for months at a time. It is NOT stress. Its quite common. I've had ten jags and they've all done it at one time or another. They've done it in every kind of situation imaginable. Alone, with larger tankmates, with smaller tankmates, in big tanks, in little tanks. Some darker than others, with more than a few being totally black.
They'll stay dark til they're larger and more confident in themselves and their surroundings. All of the Parachromis change coloration from time to time depending on mood. If you've kept them long enough, you know the amazing difference between normal and breeding dress. The managuense turning dark is absolutely nothing to worry about.
And the dark managuense in the first photo is male. Its all in the face.
They'll stay dark til they're larger and more confident in themselves and their surroundings. All of the Parachromis change coloration from time to time depending on mood. If you've kept them long enough, you know the amazing difference between normal and breeding dress. The managuense turning dark is absolutely nothing to worry about.
And the dark managuense in the first photo is male. Its all in the face.
Looking good!