[Pavel Chaloupka]

Hey everyone, I would not worry about water changes being dangerous. I have done many changes in tanks where I did not know clutches were in and nothing wrong happened. And I have to say that I do really big changes, sometimes even 80+% of water exactly for the reasons that Rafael stated. I use prepared water with stable pH and I care about the temperature being the same, but still if you do this to susceptipble fish, you would certainly experience problems. And after freeswimming, the fry is even harder, so after this experience, I even raised Paros fry in small bowls and changed 1/2 a water twice daily to get rid of hungry rotifers before replacing them with fresh.