My betta died yesterday and the other fish in the tank are dying. What am I doing wrong?
I noticed my betta fish, Valkyrie, got popeye a couple weeks ago and started medicating the tank. Then I noticed he had fin rot and read on this sub to do a 25% water change every day and medicate according to the directions of the medication so I did that. Yesterday was day 10. Valkyrie's popeye didn't get any worse but his fin rot got expontentially worse on day 8, even with the daily water changes and medication. He developed dropsey on day 9 and passed the next day, yesterday. I lost one of my pygmy corys this morning and am wondering what in the world is going on.
I will be buying a water testing kit tomorrow and see what the water parameters are, but what do I need to be looking for? I had 6 pygmy corys before Valkyrie's sickness and now I only have 3. Even with the cleaner water and meds, something is killing my fish. This is a 5 gallon tank with driftwood and living plants in my tanks only (i dont have any fakes). What am I doing wrong? How can I heal my tank?