2 days ago i bought 4 guppies for my cycled 13 month old tank. I noticed one begas to swim more slowly than the others, and gradually got worse. This morning he was half stuck in the filter, i got him out and hes swimming, but in a vertical position, head to surface, tail pointing down. I am about to treat with salt ina random attempt, any idea what this might be.
Ammonia 0 Nitrite 0 Nitrate 20
Ammonia 0 Nitrite 0 Nitrate 20