Hi! I'm a long-time lurker but recently started having problems with my moor after multiple moves, so I figured it might be a good idea to make an account and ask the experts. Here's what's going on: I think he damaged his eye somehow, though I can't be sure. The eye is enlarged and cloudy (photo at the bottom of this post). As per the usual instructions, I kept a close eye on my water values (as close as possible - I'm not home on weekdays), did plenty of water changes and even added an extra canister filter so I could be extra sure no odd fluctuations were going on while I'm gone and my mother takes care of the fish. I expected the injury(?) to clear up relatively quickly, but it hasn't.
The fish has been bottom sitting on and off, though he does perk up during feeding time and when I'm moving around in front of the tank. The eye was at its biggest a few weeks ago and has improved a bit since then but remains cloudy and enlarged. The fish has been through some stress from having to be moved twice, so I'm thinking of some kind of internal bacterial infection that was able to develop due to the stress. Now here's the bad news: I live in The Netherlands and have not been able to find medicated food ANYWHERE. Just very expensive koi food that I suspect may not be suitable for goldfish. I do have a "normal" antibiotic available, JBL Ektol Bac.
Because large water changes, keeping things stress free, the extra filter etc. haven't done much and the fish is still bottom sitting, I'm now debating whether to use the antibiotic I have. I'm unsure because it's meant for external infections such as fin rot. I don't want to expose the fish to an ineffective medication, as antibiotics are obviously not something to just throw around whenever something is slightly wrong. My question here is: what do you guys recommend? Does my diagnosis seem correct?
Exact water values are coming in a bit! Though they obviously don't reflect the water values of the past weeks this has been going on.
Other Required Info:* Brand of test-kit used and whether strips or drops? Drop test kit.
* Water temperature? During the last few weeks it has slowly increased from around 17°C to around 20°C degrees due to Spring starting.
* Tank size (how many gals.) and how long has it been running? 65 gallons, has been running for around three months.
* What is the name and "size of the filter"(s)? 1 internal Superfish Aquaflow 400L/h, 1 external Eheim 2213 440 L/h, recently added one Eheim Professionel 2224 700L/h. All contain plenty of biological filter media. Cleaning them is rotated: one every week.
* How often do you change the water and how much? Around 75-80% is changed every Sunday or Monday when I'm at home.
* How many days ago was the last water change and how much did you change? This problem has been going on for a while, so this question isn't too relevant. I changed 75% 7 days ago, though, and will be doing so again in a minute.
* How many fish in the tank and their size? There are two large goldfish in the tank. One full-grown Demekin and the sick fish, a slightly longer-bodied Moor. I don't know their exact size or weight but they are both pretty much full-grown.
* What kind of water additives or conditioners? No water conditioner, as these are not necessary with our tap water. No other additives.
* What do you feed your fish and how often? Give the brand, type of food (sinking/floating pellets, gel food, steamed vegetable, etc.), and how frequently you feed each. Sinking soft New Era Goldfish pellets, have been feeding these for around five months. Hikari Staple before that. Frozen (usually black) mosquito larvae twice a week. Algae pellets with spirulina occasionally (brandless). The fish are fed between 1-3 times a day.
* Any new fish added to the tank? Nope!
* Any medications added to the tank? Nope!
* List entire medication/treatment history for fish and tank. Please include salt, Prazi, PP, etc and the approximate time and duration of treatment. The fish has only been treated after I first got him (2012). He was treated with an ich medication (GoldOomed if I recall correctly), eSHa 2000, several rounds of antibiotics (Sera baktopur) and a brandless medication for flukes. As you can see he was quite sickly when I got him, but has been very healthy ever since - until this happened. Unfortunately since it has been so long I don't remember the exact duration of the treatments.
* Any unusual findings on the fish such as "grains of salt," bloody streaks, frayed fins or fungus? Swollen, cloudy eye. A few fungussy spots on the tail that are likely due to stress as well - he used to get these when he had other issues as well.
* Any unusual behavior like staying at the bottom, not eating, etc.? Bottom sitting on and off: he bottom sat for around three weeks refusing most food, then swam happily for a week and has now been back to bottom sitting for the past few weeks, though he does perk up when food is added.