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Tank size:
pH: 7.8
ammonia: 0
nitrite: now 0.25
nitrate: 5
kH: 15
gH: 10
tank temp: 79.0
Fish Symptoms (include full description including lesion, color, location, fish behavior): No lesions, breathing rapidly, some at top of tank, some at bottom. Difficulty swimming, those fish at the top seem to wobble when they swim, the fish at the bottom are propping themselves against rocks to keep from rolling over. Clamped fin, rapid onset for the majority of tank inhabitants, they just ate @ 12:30. (2.5 hrs ago).
Volume and Frequency of water changes: 50% weekly.
Chemical Additives or Media in your tank: foam inserts, ceramic rings, no carbon.
Tank inhabitants: those listed in signature, minus 1 lab, 1 acei, 1 demasoni, 3 pictus.
Recent additions to your tank (living or decoration): none
Exposure to chemicals: none