Advice needed!
Need some help pretty urgently. Had a Platy die overnight and not sure what to do. It’s a new tank and we were advised that once the temp was stable at 26 degrees we could add fish. Clearly something isn’t right as one has already gone and they had only been in the tank for a day. The water was clear but now it’s cloudy and the fish are all swimming at the surface. I’m tempted to take them all back to the shop for their own safety… I guess it would be good to know what people think is a good next step, or am I honestly better off just returning them and just accept that I’m clearly a danger!