01-15-2011, 10:12 AM
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Originally Posted by Fish4Andy
On Monday I went to my local pet superstore to buy a fish tank. I purchased a complete kit which came with a 35L tank, 50W heater, Marina S10 filter, Nutrafin AquaPlus, and Nutrafin Cycle. I followed the advice of the store and setup the tank as per instruction.
After leaving the tank three days I introduced 6 new fish, Mollys. They seemed ok at first but shortly after they were swimming around at the top as if they needed air. I lowered the water level slightly to allow of more air bubbles to be blown into the water by the filter. Eventually three of the fish died and the remaining three were still at the top.
Today I took a water sample into a different shop to find the cause of the problem, which turned out to be the pH. I purchased a wide range testing kit which indicated the water was between 8.5 and 9.0. I have now purchased some "API Proper pH 7.0" which is supposed to balance the pH to 7.0. I have been adding small amounts very slowly so not to shock the fish but they are still at the top with their head on the surface.
You introduced WAAAY too many fish WAAAAy too soon. You need to put 1 small fish in that tank and feed it lightly for a couple of weeks. THEN, add another, and so on. Zebra Danios have always served me well for cycling tanks. I can't remember ever losing a fish.