Fish With White Pupil

[Ginge2010]

Hi i would like some help after checking my tropical fish tank i noticed my gold fish has got a white pupil he has also been acting sluggish usually he is very active and he only came out when i put some food in the tank iv had him over a year he spent 6 months in my turtle tank and after selling my turtles he was put in my tropical tank so i checked the water and then done a water change and cleaned the filter in a bucket of tank water my heater is set at 28 and all my fish are fine apart from goldfish and he has never been in cold water since i had him and has been fine up untill know.
Results of water tests are
Ph - 6.00 ppm
High range ph - 7.4 ppm
Ammonia (nh3/nh4+) - 0.25ppm
Nitrite ( no2-) - 0 ppm
Nitrate (no3-) 0ppm

His tank and tank mates are
Fluval roma 200 (200 ltr) filter is fluval u4

Guppys
Pleco
Clown loach
Bronze cory
Peppered cory
Micky mouse platy
Mollys
Whip tail cat fish
Upside down catfish
Silver dollars
2 x shubunkies
1 x big goldfish

Thanks

 

[PrairieSunflower]

Your tank looks like it may be overstocked.
 
Sounds like your goldfish is suffering from cloudy eye which causes a white cloudy eye, sometimes a swelling sort of bubble look to the eye as well as general unwell behavior such as lethargy.
 
It can be treated with meds but can also be treated with pristine water (I noticed you have some ammonia on your results which can cause cloudy eye) and be healed in about 2 weeks.

 

[Ginge2010]

Yeah there's not as many fish in there know iv had some of my old fish pass away tank is cleaned on a regular basis and none of my other fish have got it do you know what meds i myt need and could it be an injury because before he went ill he was attacking my smaller fish i just thought he picked on the wrong fish and they snapped back just a thought