65 Gallon Tank Black neon tetra white eye

Hi everyone
I'm a long time reader first time poster so firstly thanks for all the knowledge.

Having had a 12 gallon tank for five years and kept fish through my childhood I recently got a 65 gallon setup. I cycled it for a month having added the requisite quick start amount, then after testing water went to my LFS 3 days ago and got 6 black neons. Matched the LFS temperature and added them after 1.5hr acclimatisation/ adding my aquarium water slowly etc. They all seemed great but this morning noticed one of them has this white, almost fluorescent patch on one eye, and seems a bit lethargic.

Normal side:



Abnormal side:




Thank you in advance for advice
John
Emergency card details:

Tank
Volume- 65g
How long has the tank been running? -4 weeks
Does it have a filter? - fluval 307
Does it have a heater? 25 celcius
What is the water temperature? As above
What is the entire stocking of this tank? 6 black neons, one nerite snail

Maintenance
How often do you change the water? Weekly 20%, adjusting for parameters as needed
What do you use to treat your water?
Aquasafe
Do you vacuum the substrate or just the water? Yes both

*Parameters - Very Important
Did you cycle your tank before adding fish? Yes
What do you use to test the water? API test strips
What are your parameters?
No3 10mg/l
No2 1mh/l
Ph 7.5
Kh 20 (same as LFS- hard water area)


Feeding
How often do you feed your fish? Once so far
How much do you feed your fish?
5 mins slow feed frozen daphnia


Illness & Symptoms
How long have you had this fish? 3 days
How long ago did you first notice these symptoms? Today
Have you started any treatment for the illness? No
Was your fish physically ill or injured upon purchase? Did not notice- could have been
How has its behavior and appearance changed, if at all? Bit lethargic

 

Looks like she might just be blind in one eye. Not exactly something you would notice right away.
I don't think it's a disease but definitely keep an eye on it if she gets worse.

 

Hi

I wouldnt be sure that the tank is cycled if your reading 1ppm NO2?

A reading for NH3 would be good too. with only 6 small tetras in a big tank its not going to be hard to do a fish in cycle though. Just water changes more frequently to keep NH3 and NO2 as close to 0 as possible. You have NO3 so it should be close to cycled unless your tap water has any of the above?

 

Looks like she might just be blind in one eye. Not exactly something you would notice right away.
I don't think it's a disease but definitely keep an eye on it if she gets worse.

Thank you. I will be watchful and update

Hi

I wouldnt be sure that the tank is cycled if your reading 1ppm NO2?

A reading for NH3 would be good too. with only 6 small tetras in a big tank its not going to be hard to do a fish in cycle though. Just water changes more frequently to keep NH3 and NO2 as close to 0 as possible. You have NO3 so it should be close to cycled unless your tap water has any of the above?

Think I need more informative test strips. Based on my past experience I'd assumed a month plus the quick start bacteria from the bottle combined with those readings was ok. Will get better test kit and double check

 

Looks like she might just be blind in one eye. Not exactly something you would notice right away.
I don't think it's a disease but definitely keep an eye on it if she gets worse.

Just in case you were interested- you were exactly right. The fish has been fine for the last month as has the aquarium in general. Thanks for your advice.
John

 

Glad to hear she wasn't sick