This Sunday night I came back to my apartment. All the tanks were in tip top shape, but when I looked at the piranhas they were all darker in colour then they were Friday night when I left for the week end. I fed them and then did a water test and every thing looked good, but they are still darker. I am wondering if this darker colour means any thing or is it that they are or are not stressed.
Any help would be much appreciated.
Any help would be much appreciated.