Can anyone give me any advice on this please?
My Oscars are getting white patches mainly on their heads reguarly. The patches are about the size of a pea or so, and usually flat but one was a bit furry a few days ago. They usually disappear on there own but last several days, the fish seem healthy and are eating well.
Main details -
450 litre tank
2 Oscars about 9 or 10 inches long
2 Plecs (they don't get the white patches)
Ammonia = 0 ppm
Nitrite = 0 ppm
Nitrate = 10-20 ppm (usually lower after a water change)
phosphate = about 4 ppm
pH = about 7.6 (not sure what this should be)
I feed the Oscars once a day on pellets and give them worms/prawns/beef heart about once a week or so.
I was using salt as a general tonic but have stopped as the pH was getting quite high, well over 8.
I clean the tank well every week, clean all filters and vacUum gravel, changing about 80-100 litres of water per week.
One other thing - I have a structured background in the tank which allows some debris to gather behind it which can't be removed, could this be a problem? I hope not otherwise it will have to come out.
Here are some pictures but they aren't great as they won't keep still long enough to take them.
Any ideas would be great thanks.





