Laetacara Curviceps Dwarf Flag Cichlid

I just found out that their Chinese common name
in Singapore is the 'Goat's Head Fish'. Funny, I don't think they look anything like a goat's head. I had a couple of them some years back and they breed easily. No babies, though. Could be a water problem. Anyway, they died after 2 years and I recently bought a few when I managed to find them again. They are constantly in good colour, but all of them died within months. I have no idea of what is wrong. My tetras are spawning in the tank and so I do not suspect a water problem. Anyway, I have no idea what is the colour of the fish. They appear pale and yellow in shop tanks and become very dark with bright blue and yellow in my tanks. But they seem happy and confident. When they breed, they are even darker. I assume that they look pale and yellow because they are scared and stressed in the shop tanks and when happy, they look almost black.

If you like jewels but think they are too aggressive for your tank, then
you'll like this fish. They will breed easily and aren't very aggressive. I recommend this fish for beginners or anyone.

They are in a community tank with 4 Clown Loaches and 2 Bala Sharks and 1 Albino Ruby Shark.