Started out as two small red pindots on top of a bump and over the course of a week these two bumps have gotten larger and black. Haven't added anything to the tank. Thought she'd bumped her head but it seems to be getting worse, any ideas? Acts pretty normal.
Water perams:
Ammonia: 0
Nitrite: 0
Nitrates: 30

Water perams:
Ammonia: 0
Nitrite: 0
Nitrates: 30

