11-08-2011, 01:02 PM
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Well, I know the pH before was about 7 and after was a little higher about 7.2 or 7.4. I find the scale difficult to read in that range. Its certainly a smaller pH change theh I has done in the past, so Im pretty sure it is not pH.
I dont know the hardness. I do know that I add baking soda periodically to keep the pH up, so if that raises the hardness then there would have been a drop in hardness with the water change. I have been doing that more recently so the effect this time might have been bigger. I've never lost fish with a water change before.
I did not check the nitrates before, but knew they would be high, which is why I did a big water change. I am overstocked and it was a little longer than I usually go between water changes. They are between 20 and 40 now, so probably 100 to 150 before.
I have not lost more fish since last night, which is a relief. However, I don't know if I can save the kribensis fry. They are out of the cave now, which they never have been before, and just waiting around. I put another small tank upside-down over the area to protect them from the rainbows, but some have somehow escaped. I did feed them some baby brine shrimp, but I'm not sure if they can even eat them now. All the other batches had a very good mom to protect them through the early days.
hardness or water temperature makes the most sense to me. The water temperature before was 74 (that is the temp now, so it should have been the temp before since I have not changed the thermometer) and the temperature after was 72 maybe as low as 71. The swing couldn't have been more than 4 degrees.
Are gouramis really, really hardy fish? Whatever did it mostly killed large fish, except my gourami which was by far the largest fish in the tank.