How big of a water change can I do at one time without hurting my fish?
Chenay83 said:Four days ago everything was perfect. I did I did a water change the next day because I have lots of fry in my tank so I change the water every 2-3 days. I waited 24 hours and tested it again and it was good. Today I found one of my guppies floating and a fry. Because I have a lot of plants there is no telling how long they were dead, maybe their bodies were hung up in it. The tank has been running for 6months 4 months with fish.