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post #1 of 2 Old 12-05-2010, 11:45 PM Thread Starter
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heater = fatal?

I have a fully cycled Fluval Edge 6 gallon that i've been running with-out the need of a heater. The tank has been up for nearly two months and has (now had) a school of 6 neon tetra. They have been doing wonderfully up until yesterday....

The temperature here in Texas has been a steady 70 - 90 degrees for the last 2 months, well as December has come around the temperature has dropped to nearly 30 degrees F (duh, winter=cold). In turn, yesterday I picked up the 50w heater by Tetra to try and keep my water temperature more stable for the little guys. After hooking up the heater and making sure it turned on last night, I left for the weekend only to return tonight and find all but one of my Tetra's dead...

Could it be that the 5 or 6 degree increase in water temperature was to much to handle? Did the temperature in the tank vary to much as the heater turned on and off throughout the day?

No sign of sickness and levels are ideal.
Ammonia: .25
Nitrite: 0
Nitrate: 5

Any ideas?
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post #2 of 2 Old 12-06-2010, 04:39 AM
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[quote=drs0182;527899]I have a fully cycled Fluval Edge 6 gallon that i've been running with-out the need of a heater. The tank has been up for nearly two months and has (now had) a school of 6 neon tetra. They have been doing wonderfully up until yesterday....

The temperature here in Texas has been a steady 70 - 90 degrees for the last 2 months, well as December has come around the temperature has dropped to nearly 30 degrees F (duh, winter=cold). In turn, yesterday I picked up the 50w heater by Tetra to try and keep my water temperature more stable for the little guys. After hooking up the heater and making sure it turned on last night, I left for the weekend only to return tonight and find all but one of my Tetra's dead...

Could it be that the 5 or 6 degree increase in water temperature was to much to handle? Did the temperature in the tank vary to much as the heater turned on and off throughout the day?

No sign of sickness and levels are ideal.
Ammonia: .25
Nitrite: 0
Nitrate: 5

Any ideas?[/quote

Neon Tetra's much prefer water between 73 and 75 degrees F. If temp was not raised slowly, a couple degrees each day,and suddenly got warmer then it could have become stessful depending on what temp of the water was,and what it rose to after installing the heater.
I once had a heater malfunction and temp in the tank rose to near 90 degrees F overnight. It killed all but a few of my fish.
Ammonia level you posted needs to be zero in a cycled tank with healthy biological filter.
I suspect the dead neons gave cause for the ammonia levels to rise.

The most important medication in your fish medicine cabinet is.. Clean water.
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