Recently, my 7 1/2 year comet has developed a white bulge above her eye. Ori (another goldfish who was acquired 2 weeks ago) was isolated for week, then transferred to Morgana (comet’s) tank. He started nipping at her tail and fins so after a couple of days he was placed back into quarantine - until her fins heal up, then we’ll see how he does on a second chance. The bulge could just be colour change, but maybe parasite or sign of stress?? Here are some stats... 120litre tank for Ghana. Internal filter with carbon. Ghana has been in this tank for around 4 years. Test strips say water parameters are fine Water changed last on the 4th May 2019 Tank has assorted gravel and various plants No chemical media (apart from tapsafe and aquarium salt) Just Morgana is in the tank at the moment, but we put another goldfish in there around two weeks ago, who now is in a quarantine 48l tank due to fin biting, until her tail heals up. There are live plants in the tank Morgana (a 7 1/2 yr old comet) has recently developed a white bulge on her ‘eyelid’. There are some captioned photos attatched - hope they’re useful! Would absolutely appreaciate any advice/diagnosis - love my goldfish ) -C Ps. Pretty sure she’s a comet - she could just be a regular goldfish?