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Tank size: 125 gals
pH: 6.8
ammonia: .50
nitrite: 1.0
nitrate: 20
kH: 300
gH: 120
tank temp: 75F
Fish Symptoms (include full description including lesion, color, location, fish behavior): fish are just dying, guppies grouping at top of tank in the corners.
Volume and Frequency of...