What Is Wrong With My Fish?

[Tweak3D]

ok, I have a ten gallon tank, water changes every week or more often if needed, setup the tank to prevent large amonia/nitirite/nitrate spikes, change filter media every 2 weeks, water temp is 84 degrees. I had 5 black neons tetras and 5 neon tetras. I lost 1 fish to what appeared to be neon tetra disease 2 weeks ago, since all has been fine. Now, All of a sudden, I have lost the other 4 neon tetras and one black neon. Whatever is happening to them is happening rather quickly. like in under an hour or so. becuase they will be schooling and then all of a sudden sperate, start swimming towards the surface and just haning out there vertially twitching. Then the back half of the fish turns white, they sink, and die on the bottom. I've done more water changes and done testing, all my numbers are fine, what is this? I've medicated the water for parasites so I am not sure if thats what it is or what. attached are some pictures. any help is greatly needed, I don't want to lose my last 4 fish! attached are pictures of the color change

 

[Tolak]

More info is needed, you need to be more specific with test results.


pH:
ammonia:
nitrite:
nitrate:
kH:
gH:


Volume and Frequency of water changes:

Chemical Additives or Media in your tank:


Recent additions to your tank (living or decoration):

Exposure to chemicals:

Procedure followed for tank maintenance:


Also, how long has the tank been running?

 

[fishyfeet]

if you change your filter media every two weeks, surely you have to recycle the tank all the time.

Neon tetra disease is untreatable what happens is one fish dies the other fish nibble the dead fish and become infected and so on, any sick fish should be quarantened and new fish also before adding to the tank. di

 

[Tweak3D]

if you change your filter media every two weeks, surely you have to recycle the tank all the time.

Neon tetra disease is untreatable what happens is one fish dies the other fish nibble the dead fish and become infected and so on, any sick fish should be quarantened and new fish also before adding to the tank. di

I don't change the sponge every 2 weeks, just the charcoal and the sold amonia absorber. When I do clean the sponge I clean it with water from the tank it was in, water that I am replacing.

I have a 10 gallon tank, had 5 neons and 5 black neons. ph is 7.6, ammonia/nitite/nitrate are all at 0. only chemical added to the tank are a liquid fertalizer once a week with water changes which also has a water conditioner to remove chlorine. most recent addition to the tank were the 5 neon tetras almost a month ago now. tank has been running for about 3 months now. I generally clean the tank all together once a month for a full all out cleaning. I use a gravel vacumm to clean the gravel, a clean, non chemical sponge to whipe the glass down. I have a piece of drift wood I scrub all of the algee off of, I also sometimes remove the top layer of gravel and boil it in water to kill alge growing in and on it and to disinfect it. this isn't very common though, only when algee gets out of hand. Only chemical other than the fetalizer is I put a disolvable tablet to kill parasites when I thought they might have had a problem.

 

[fishyfeet]

oh sorry i must have misunderstood, well having re read your original post i would say that 84 is way to hot, the warmer the water the less oxygen for the fish, i have cardinal tetras and the tank temp is about 77, although it gets hotter in the summer, i would either lower the temp to 80 on the heater or even 75 is fine.
The other thing i would do if you have to have the tank that hot is add an airstone then.

Out of interest how much water do you change weekly, you should aim at 20% and clean the gravel with a gravel cleaner at the same time as most of the nitrates will be rotting food and plant matter in the gravel.
As you are having problems i would do 10% daily for a couple of weeks.

Either your fish are infected when you get them, or your water quality is pants, (a test would tell you)
a twice weekly water change and gravel cleaning would sort that out. di

 

[Tweak3D]

thanks, ill take that advice. hopefully the last 4 stay strong, they are looking good thus far.

oh sorry i must have misunderstood, well having re read your original post i would say that 84 is way to hot, the warmer the water the less oxygen for the fish, i have cardinal tetras and the tank temp is about 77, although it gets hotter in the summer, i would either lower the temp to 80 on the heater or even 75 is fine.
The other thing i would do if you have to have the tank that hot is add an airstone then.

Out of interest how much water do you change weekly, you should aim at 20% and clean the gravel with a gravel cleaner at the same time as most of the nitrates will be rotting food and plant matter in the gravel.
As you are having problems i would do 10% daily for a couple of weeks.

Either your fish are infected when you get them, or your water quality is pants, (a test would tell you)
a twice weekly water change and gravel cleaning would sort that out. di