u/Defectivetheunicorn

The ph is perfect, so is the alkalinity, I’ve changed the water, the filter, cleaned the pebbles and changed feeding schedules. They’ve all been in the tank for a month plus minus the orange sword tails which I put in two weeks ago. I thought I could be over crowded, but the fish I had in there before I added more were doing the same thing. I really want to do right by my fish, I don’t want to neglect them or have an easily solved problem end up hurting or killing them. Anyone with any advice please let me know I’m desperate