[Bubbles on scales?]

Thanks for your reply. What causes them to bloat? Food or Water contamination maybe?

[Bubbles on scales?]

Hello

Could someone possibly advise what the bubbles which have appeared on the pictured fish are? They appeared over a period of 24 hours. Fish has appeared bloated over the past week and seems more pale in color.

shares the aquarium with an angle fish.

Advice appreciated. Thanks