What is this? Hole in the head??? Parasite??
My parameters are good
ph is 7.2
Temp is 72F
no amonia
I do a 25% water change every week and a 75% once every month
No fish added within the past 7 months
I went to bed last night and everyone looked fine, and went to work this morning at 5:30 so i didnt turn the light on or feed them. When my girl woke up around 10:30 she turned on the light and found him like this. What is it and what should i do?
