Tank size: 10gal
pH: 7.6
ammonia: 0
nitrite: 0
nitrate: 5
kH: ?
gH: ?
tank temp: 78
Fish Symptoms (include full description including lesion, color, location, fish behavior): One fish has white, stringy poop that is a few inches long.
Volume and Frequency of water changes: 50%, every 2-3 days...