hi everyone...i have a question for everyone ...ok here it goes my husband and i have had a freshwater tank set up for years now and all the fish are doin well in the tank so the other day i had decided to buy some more colorful fish to add to the tank...i had bought two albino tiger barbs and two gourami dwarf we had let them float in the tank for at least 20 minutes before releasing them with the others that we have in there..well all was doing good except for one of the gourami had died so i took it back to the pet store and took a sample of our water and they told me that the water had a high nitrate level and i/we need to change it once a week..now here is the question if the tank has been astablished for over 3 years and all of the other fish are doing great and the three that i had bought are doing fine could it be that one fish (gourami) was an ill fish to begin with...?? we have never had any problems like this before...what i should have done is told the girl at the store i wanted to test her water that fish were in ...any comments would be appreciated...
thank you
thank you