About a week ago, I noticed some of my cardinal tetras looking funny. It seemed they had a few bubbles growing out from underneath their scales. Over the last few days it has progressed and I have lost a few of the tetras. They must be uncomfortable, but they are acting fairly normally (schooling, eating well and voraciously, not flashing). I have other species of fish in the tank and none of them seemed affected, just the cardinals. Now this morning the lone rummy-nose tetra and one of the neon tetras is starting to develop bubbles as well.
All of my internet searching has led to only Gas Bubble Disease as a possible cause, but the photos dont match and it doesnt start near the head and mouth, but towards the tail. I also dont change the water with cold water, but match temps before adding it.
Tank info:
45 gallon corner tank. Sand bottom, planted low light. Eheim cannister filter, air bubbler, heater.
Stock: 14 cardinal tetras, 11 neon tetras, 1 BN pleco, 2 GBR, 4 peacock gudgeons, 1 gold tetra (came with the tank), 1 rummynose tetra (came with the tank), 2 male guppies, 3 nerite snails, 5-10 ramshorn snails
I do not feed live food
Parameters: Ammonia: 0, Nitrite: 0, Nitrate: 30
Water changes 40% weekly
I have 3 other tanks, none are showing any signs of disease. I have added nothing to that tank in 2 months. The tank has been established for over 6 months. It did have ich a few months ago that was brought in on a plant I bought from my LFS, but successfully treated. No fish show signs of ich and havent since I stopped treatment over 2 months ago.
Any help figuring out the cause would be appreciated. I really dont want to treat for something at a guess and really dont want to lose any more fish.
All of my internet searching has led to only Gas Bubble Disease as a possible cause, but the photos dont match and it doesnt start near the head and mouth, but towards the tail. I also dont change the water with cold water, but match temps before adding it.
Tank info:
45 gallon corner tank. Sand bottom, planted low light. Eheim cannister filter, air bubbler, heater.
Stock: 14 cardinal tetras, 11 neon tetras, 1 BN pleco, 2 GBR, 4 peacock gudgeons, 1 gold tetra (came with the tank), 1 rummynose tetra (came with the tank), 2 male guppies, 3 nerite snails, 5-10 ramshorn snails
I do not feed live food
Parameters: Ammonia: 0, Nitrite: 0, Nitrate: 30
Water changes 40% weekly
I have 3 other tanks, none are showing any signs of disease. I have added nothing to that tank in 2 months. The tank has been established for over 6 months. It did have ich a few months ago that was brought in on a plant I bought from my LFS, but successfully treated. No fish show signs of ich and havent since I stopped treatment over 2 months ago.
Any help figuring out the cause would be appreciated. I really dont want to treat for something at a guess and really dont want to lose any more fish.
