After having water problems in the aquarium and getting good advice from you guys ive been doing PWT's for a few weeks now, giving the gravel a good vaccum each time and all my goldfish seem alot better and look and seem really healthy all except 1
.. i've checked the water quality which reads as safe levels, ammonia=0, chlorine=0, nitrate=25, nitrite= under 1, GH
= about 12, KH
= 6', pH=7.6....
It's the smallest goldfish who is now unwell, it lies at the bottom of the aquarium, sometimes on its side and only swims on occasions, it seems to be breathing heavily and 1 of its eyes looks a little cloudy and bulgy.
i've read that the water quality is usually the cause for problems and it affects the weaker fish but this cannot be the case as the water levels all read as being safe.
Does anybody have any idea what could be wrong with it? Is really worrying me