Bangai cardinal sick

[mihaivapler]

Attachment 15147What is this on my bangai gills?do anyone have seen this before?hi is like this for about 2 months now but in the last week started to grow bigger,he is ok he eats like a pig doesn't show to have problems because of it but i'm worried that will kill him.also since he has this he doesn't keep the eggs in the mouth,he keeps it for a day and the next day they are gone.