I have a mature tank with mostly rainbow fish in which I've had for years. They never seem to get ill. A few weeks ago I added a dwarf gourami he is now looking very drably coloured and poorly. Years ago when I had one of these fish before the same happened. Thing is I love them but I wonder if our hard water is to blame. I don't want to get another one if this is the problem as its not fair. Does anyone know if its likely to be this or if they are, perhaps, just a bit overbred and not very hardy? Water parameters fine by the way and tank not overstocked.
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