I've got two fish who seem to be ill, there are no problems with the water parameters and they are still eating. But age is against them, they're both 3 years old. One is a platy who has taken to sitting on the bottom of the tank, sometimes on his side, rapid gill movements, he can still swim and eat. The other is a sword tail, similar to the platy he doesn't swim a lot and is usually resting in the roots of a planted rock. So my question to the forum is are they passing from age related issues? Or am I missing a clue to something I can help! Please help!