11-18-2013, 02:56 PM
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Welcome to the fourm Lou.
I merged your first thread that you started with the same post into this one to keep it all in one place.
Sorry about your fish loss. What were your ammonia and nitrIte reading after adding all of those fish at once?
Unless you introduced a new disease into the tank, my guess would be water quality killed your fish. If you added that many at once, your beneficial bacteria wouldn't be able to keep up with the new bioload introduced.
What does filter fairly clean mean?
With that many inhabitants, you should be doing much larger water changes (at least a third or more) weekly with a good gravel vac. and adding a good conditioner like Prime with the new water.