BristolBulldog

leading on from my last disastrous post.

I now have two tanks running. We have noticed that some fish have slightly red gills. The fish seem fine, swim as they always have done, and are not gasping for air at all. Aeration is done with three air stones. i had this in a previous tank, and it never caused an issue. other fish in the tank do not have the same issue, and they have shared the tank for over a week now.

i know this is normally an aeration issue, but the tank isnt highly stocked or anthing.

any ideas?

thanks.