I have a 15 gallon tank in which I had 7 juvenile cardinal tetras and 12 juvenile pygmy corydoras for the last week (of 4 weeks QT).
I perform water changes daily or every other day with dechlor.
Fish have shown no sign whatsoever of illness - no odd behavior, no markings, eating properly, swimming actively etc. Observed them last night for a while and everyone was as fine as ever.
This morning I woke up and had lost 3 or 4 of the tetras and 5-6 cories. Dead, stuck to filter or on bottom of the tank. I immediately removed the bodies and performed a 50% water change with 5x dose of Prime. Some of the remaining fish look fine and some look distressed.
I tested the water which came out of the tank and it was 0 nitrites 0 ammonia.
I have come to 2 possible causes and wondering if this sounds what could have happened:
a) I put in a new heater last night because the old one wouldn't go below 80F even with it at the lowest setting. Is it possible the new heater has an electrical leak and shocked the fish? Temp is 78 so it didn't plummet or anything.
PLEASE CONTINUE BELOW - aquariacentral not letting me really post tihs at once i am not sure why
I perform water changes daily or every other day with dechlor.
Fish have shown no sign whatsoever of illness - no odd behavior, no markings, eating properly, swimming actively etc. Observed them last night for a while and everyone was as fine as ever.
This morning I woke up and had lost 3 or 4 of the tetras and 5-6 cories. Dead, stuck to filter or on bottom of the tank. I immediately removed the bodies and performed a 50% water change with 5x dose of Prime. Some of the remaining fish look fine and some look distressed.
I tested the water which came out of the tank and it was 0 nitrites 0 ammonia.
I have come to 2 possible causes and wondering if this sounds what could have happened:
a) I put in a new heater last night because the old one wouldn't go below 80F even with it at the lowest setting. Is it possible the new heater has an electrical leak and shocked the fish? Temp is 78 so it didn't plummet or anything.
PLEASE CONTINUE BELOW - aquariacentral not letting me really post tihs at once i am not sure why
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