Yesterday, I did a 25% water change, treated the new water, added aquarium salt. According to my last readings: Ammonia: 0 Nitrite: 0 Nitrate: ??? PH 8.0 Today, I looked into the tank, and one of my swordtails has a lump in front of her tail on top of her lateral line. What the heck is it? She's swimming about normally and eating well. Also, I can't quarantine. The tank I was going to use for quarantine had callamanus worms and I'm currently in the process of cleaning/drying/sterilizing it. Here's the lump That shiny spot is where the lump is. It's the same color as the rest of the fish, just catching the light because it's... lumpy.