We've purchased a tank some 4 weeks ago and settled 2 Blue Orandas in after
a week. They have been quite happy. Now one of them has a very fine white
'fluffy' stuff on his scales and sits at the bottom of the tank and does
nothing. The other fish is active. We've changed the water regularly and
done all the tests Ph (7.2) Nitrites(2ppm), Ammonia(0ppm) and nitrates
(40ppm) and still can't seem to find out what is wrong. We've stopped
feeding them this morning as it would appear that we may have been feeding
them a little too much.

Can someone possibly offer a suggestion as to what is wrong and how to
correct it.

Thanks in advance

KMP