I have 2 red turks that are always changing from very dark to very bright. When I first got them they were always bright. the both seem healthy and happy apart from there colour, and both eat very well. Is this normal? could it be something to do with change of water conditions from when I got them? I have had them for about 5 weeks. any input would be appriciated. Oh I do a 25% water change every second day and water states are,
PH 7.4
Ammonia 0
Nitrite 0
Nitrate 5ppm
GH 300ppm
Our tapwater is very hard, Could it be that? One fish was from the gold coast, which I hear has soft water, and the other is from a breeder that has rainwater.