I started out with 4 platys in a 200l tank and a seeded filter. I did 30 percent a day water changes and to put a long story short 2 platys have died.
One of the females died and then the second was getiing bullied so i put it in the haspoital tank and it seems fine. Then one of the males died so now i only have 1 platy in a 200l tank, and i am worried that the bacteria will die due to the lack of nutrients. What should I do??? Less water changes??