Every fish died but the one with neon tetra disease

virgowithanego

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I did SO MUCH research before getting these babies. So heartbroken to have lost 12/13 fish. This is my second time keeping fish-- the first was a goldfish who lived very happy and healthy.

-13 fish in a 15-gallon tank: 6 neon tetras, 5 endler livebearers, and 2 sparkling gouramis.
-aquarium is heavily planted with floating plants
-temp set to 78 F, which is acceptable for all 3 species (NT: 70-81, SP: 75-85, EL: 71.5-80.5)
-slow-moving sponge filter

I cycled the tank on its own for several weeks, added 3 endler livebearers, cycled it a few more weeks, and got the rest of my fish. They began to die off one by one. I tested for ammonia and pH and saw that the pH was a little above 7 at 7.3. My goldfish was able to withstand this level, but I wonder if these little fish are more sensitive.

then I realized one tetra had an extremely bloated belly after eating (tumor like bulge in the belly) and was swimming so fast that it prevented the other fish from eating. I began putting my fish in my traveling tank just for feeding. After some research, I worried the super-fast fish had neon tetra disease. I isolated it in the traveling tank for over a week and it seemed to heal-- its behavior returned back to normal (no more fast swimming, bloated belly, erratic movements) so I put him back in the tank with the others.

Weeks later, all of the fish have died except the fast-swimming one that I now believe might still have neon tetra disease. I am beginning to think the problem may not have been pH levels but this disease. Are other species capable of catching it ? and why would the original sick tetra remain the only one living ? I am afraid to get more fish in case he is still sick but I don't know how to determine if he is. I didn't think the disease was curable yet he seems fine once again.

Very confused. Seeking advice. thanks for reading!
 

Donthemon

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Well, your tank wasn’t cycled properly to start with. Please read up on the nitrogen cycle and how to cycle before adding anymore fish. Your ph is fine. What about your ammonia nitrite and nitrate parameters?
 
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virgowithanego

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Donthemon said:
Well, your tank wasn’t cycled properly to start with. Please read up on the nitrogen cycle and how to cycle before adding anymore fish. Your ph is fine. What about your ammonia nitrite and nitrate parameters?
I tested the water for pH level, ammonia, nitrite, and nitrate before adding the remaining fish. Was it that I added too many at once ? I added the plants and some food (for ammonia) before adding any fish at all.

I was consistently checking ammonia, nitrite, and nitrate and all came out fine.
 

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