How many fish do you have and what kind?How long has your tank been running?Have you tested your water if so what are the reading i.e nitite,ammonia,nitrate,ph?I would not just put random chemicals in your tank without knowing if there is a problem or not ,it can be very stressfull to your fish and if there is a problem you have to take any type of carbon filtration out to make it affective gl
i took the carbon filter out when i was treating the fish,,,,i was so concerned about the fish i tryed the whitespot treatment because i was told it wouldnt harm the fish either way,,,,,the fish are mbuna,,and all my water parameters are fine,the tank has been running 6 months now,,,there are two fish in paticular that keep itcking,,and they are male and female,,,,so maybe dthoffset ,,,is right what he is saying in his replie.