Cory white mark on head...

Bought these four on September first, they're still in quarantine. (12 gallon.) They've been perfect and wonderful since I got them, had started to plan when I would move them over to the 57 gallon thinking they'd cleared quarantine, then saw this one today

Q. tank is cycled, I set it up with an established filter so it did go through a mini cycle when I first added them, but only very low nitrite readings managed with daily water changes, and nitrites (and ammonia, never had ammonia readings) were staying at zero after four days of daily 70-75% water changes.

Since then, 50% changes twice a week, current levels are 0/0/10, last water change was 50% yesterday, when nitrates were 20ppm. Eating well, a variety of foods, this one is still eating, and the mark only appeared today. Wondering if she spooked and bumped her head when I was water changing yesterday, or wedged herself behind the sponge filter perhaps? None of them had a mark on them yesterday though, little alarmed by how large this is. It doesn't look fungal/fuzzy yet, but will monitor. Other than moving to daily water changes and keeping an eye on her, should I be worried about something else? Potential disease? Or after 19 days in quarantine with no symptoms, is it likely to be an injury that needs monitoring rather than a disease?




@Colin_T ? Help please!

got a picture that isn't blurry?

Colin_T said:

got a picture that isn't blurry?

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Unfortunately not... I've messed up my camera settings somehow, have just been trying to fix them, and made it even worse Hate this, I did have it set perfectly, but I don't know what I'm doing with this camera

AdoraBelle Dearheart said:

Unfortunately not... I've messed up my camera settings somehow, have just been trying to fix them, and made it even worse Hate this, I did have it set perfectly, but I don't know what I'm doing with this camera

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What phone is it? I could probably help restore it since I’m a little bit of a tech nerd. But clearer pictures would definitely help. Maybe try getting a video of your camera can’t exactly focus when they move and we can just pause the video to inspect?

If the fish isn't rubbing on objects and has been fine for 19 days, then it's probably an injury. Just monitor and see how it goes.

Hard to tell from those picture but from sounds of it, is beginning to sound more like an injury more than anything.

Would suggest to keep an eye on them and monitor their behaviour for any changes at all.

Stefan3289 said:

What phone is it? I could probably help restore it since I’m a little bit of a tech nerd. But clearer pictures would definitely help. Maybe try getting a video of your camera can’t exactly focus when they move and we can just pause the video to inspect?

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You're an angel, thank you! Not a phone though (my phone is even worse) it's a legit camera, a Fujifilm X-T10.
I used to be able to able to take photos like this with it;


But I accidentally nudged the wrong button or dial or something, and despite looking up the manual and trying to reset things, I can't get it right again. It was overexposing, fixed that and now it's always blurring no matter what. Tried to adjust the shutter speed last night, and ended up doing something that means it acts like it's taking a photo, but only shows a black screen. I'm starting to hate this camera, and how little I know about photography, lol. It's not the camera though, clearly, its a good camera. Just way above my technical skills.

Colin_T said:

If the fish isn't rubbing on objects and has been fine for 19 days, then it's probably an injury. Just monitor and see how it goes.

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Ch4rlie said:

Hard to tell from those picture but from sounds of it, is beginning to sound more like an injury more than anything.

Would suggest to keep an eye on them and monitor their behaviour for any changes at all.

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Thank you!
Nope, haven't seen any rubbing or flashing, no other alarming behaviours, and the others still look perfect. They don't seem to spook that easily either, they were locally bred, not wild caught.

Today the mark looks the same, not fuzzy or infected looking, not larger or smaller.

It does seem unlikely for a disease to crop up so suddenly 19 days into quarantine though, right? And especially to suddenly take over such a (relatively) large part of the top of the head, since there was no mark there the day before. Hopefully she did just bang her head on something, and it'll heal up quickly.