Tank size: 30 gallon
pH: 6.5
ammonia: 0
nitrite: 0
nitrate: 10-20
kH: n/a
gH: n/a
tank temp: 72 F
Fish Symptoms: For about 8 days now, 1 Odessa Barb is showing symptoms - popeye in one eye, pale (no red stripe, scales are dull not shiny, black spots are faded). Still swimming and eating, but...