Fish With Growth In Gils

[fishbuddy808]

Help me please my goldfish has a growth in its gills and I do not know what to do. if you have any advice can you please reply thank you- fishbuddy808

 

[fluttermoth]

A pic would help, or could you describe the growth in detail? As always you should also post the size of tank, how long it's been set up and results of water tests.