Just a quick question: I'm using melafix for a freshwater tropical fish with a torn tail fin. He's in a hospital tank (5 gallon plastic container w/lid) with an airstone and heater (no filter).
Do I need to change the water before each new dose of the medicine? The instructions only say to dose the tank everyday for 3 to 7 days.
Thanks
Miss M
Do I need to change the water before each new dose of the medicine? The instructions only say to dose the tank everyday for 3 to 7 days.
Thanks
Miss M

![[Emergency] Small PH swing, fish possibly dead or dying??](https://www.fishforums.net/data/files/featured_images/69/featuredimages_c0fc8ac420e06166.webp)





