I just lost another platy within 4 days. I lost the other on Saturday. No signs of sickness in either fish. Its like one minute they are fine...the next I find them floating in the tank. I feel awful! I feel like such a horrible fish mommy!! My tank is cycled. I have been checking the water and I have 0 ammonia, 0 nitrites and nitrates were at 10 this morning (on the test tube kit). I have a 10 gallon tank and I use Aquasafe to treat the tap water. I do 25% water changes once a week. The PH is 7.8 and the temp. is about 79 degrees. Could I have just gotten a few bad platys or does anyone see that I am doing something wrong? I have only been doing this for about 4 weeks now and I'm getting frustrated. I get so upset when a fish dies. I have another 10 gallon tank with zebra danios and corys and they have been great!! :help: