My name is Suzanne and I just joined this forum.
We bought my daughter a 12 gallon tank for Christmas. It is our first tank. Once we got the tank cycled, everything has been going great. However, the past few weeks, we have lost 3 fish. Some details about our tank:
I test the water weekly and the tests are coming back fine. I change the water weekly and my daughter cleans the algae with an algae scraper. However, we are still losing fish.
Before the problem started, we had 2 platies, a zebra danio and 2 corydora catfish. One of the platies died and we bought two more. The two new fish only lived a week or two. Now, one of our corydora catfish is dead.
I am at my wits end. I don't know what else to do. What could be killing our fish? Before the first platiie died, we hadn't lost any fish since the tank cycled.
Thank you for any input you may have.