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fish dying
thought i would draw on the collective wisdom of this group.
i have a 300g inground pond with a 45 mil liner that has been running since april of this year. it has a 950g/hr mag pump with the discharge split into a venturi and a bioforce 1000 bio-mechanical filter. it has been home to 6 - 5 inch comets during this time with no probs. been doing 10% wcs monthly and did a 20% wc 3 weeks ago when i cleaned the filter pads (rinsing the pads in water taken from pond for the wc). i use amquel+ for water top offs and wcs (treating the water taken up in 30g plastic containers and aerating before adding to the pond). the pond sits under a patio cover in the back yard and is shaded throughout the day. the prob: i lost 4 fish in the last 12 hrs. with no signs of flashing or abnormal behavior. the four started going belly up within hours of one another. as i saw signs of them struggling to hang on (swimming erratically, etc, as dying fish do) i placed them in a 30g container with freshly conditioned water and a powerhead for circulation. they died hours apart. ran tests at first sign of distress: nh3- 0 no2 - 0 no3 - 10 pH - 7.8 i keep fresh and salt tanks and know losing fish sometimes happens. but i only lose 1 every so often - never a fish kill like this. i think i've done everything right (including adding a large bag of well rinsed activated carbon to the return of the pond last night to remove possible pollutants). i just looked in on the remaining two and they're swimming around fine - no signs of distress. i know this is long but am hoping to get some possiblities of what happened. |
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