My tank has been set up about a year, water readings are fine but the last 3 weeks I've had nearly all my fish die except 3 platys. Most have had no symptoms except suddenly becoming listless, sitting on the bottom then dead by the morning. One of the last 3 has now starting looking ill.
The last platy to die definitely had dropsy but the others have had no other symptoms.
The only change I've made is switching from gravel to argos play sand. Any ideas on what could be causing it?
The last platy to die definitely had dropsy but the others have had no other symptoms.
The only change I've made is switching from gravel to argos play sand. Any ideas on what could be causing it?
