Red bump on fantail's head
When I turned on the aquarium light this morning I noticed a reddish bump on one of my fantails head. Not sure if it's injured or got a disease that needs treating? Do I need to isolate it?
Got my water tested at the local aquatics store and they said nitrite was very slightly high but nothing to worry about just do a water change to be sure. Did a 40% water change and gravel clean on Saturday. Do a water change weekly.
Tank is 110l witha Fluval U2 filter. Has two fantails and an oranda.