Black Streaks on Fin, and bruise near gill?

Hello, my fish have been sick but finally seem to be doing better, however, I am still concerned with Flake (longer one with black streaks on fin). I do not know what it is but he has not been acting different, in fact he has been acting way better than before. But as you can see he has those streaks and what seems to be bruising on him. Any thoughts on what it could be? I attached some photos so y'all can see. They are also in a 20 gallon tank as of rn but we have a 45 gallon tank set up for when they are all better! Which is hopefully soon since they seem to be doing better.

Originally Bubbles (the fatter goldfish pictured) had ich and then a fungal infection and was not doing good at all, as of today he seems more like himself and much better! Flake was not as bad as Bubbles, but was still treated the same in case. Originally the streaks on Flake were red and not as bold, now they are black. Is this a sign of brusing? and will it go away? Any information is GREATLY appreciated, I just want my little fishes to be happy and healthy! Still undergoing treatment on both fish since there treatment cycle is not over. Let me know if you all need more information or have any question. Thank you very much!

 

Doesn't look good. I'd do a water change (30-50%) just in case. WC's are probably the best cure for something like that anyway.

 

Hi LilK2020
Welcome to fishlore.

Reading your other post it seems very likely the new tank is not cycled. There is no helpful bacteria to consume the toxic ammonia.
That mark could be ammonia burns.

An uncycled tank requires multiple water changes .
Only a water test will help you decide if 40% every 48 hours is enough or if you are wasting a little water. At the risk of wasting a little water you should be changing water NOW.

Replacing with temperature matched conditioned water.

 

Hi LilK2020
Welcome to fishlore.

Reading your other post it seems very likely the new tank is not cycled. There is no helpful bacteria to consume the toxic ammonia.
That mark could be ammonia burns.

An uncycled tank requires multiple water changes .
Only a water test will help you decide if 40% every 48 hours is enough or if you are wasting a little water. At the risk of wasting a little water you should be changing water NOW.

Replacing with temperature matched conditioned water.

This is the older tank we had set up when we first got them over two months ago, they are going through a treatment right now in the 20 gallon tank, and I have not put them in the 45 gallon tank yet, due to the fact it is still cycling and since we have been treating them. The treatment they are undergoing said to change there water yesterday which we did, we tested the water today and the ammonia level was down. Could it be anything else? or is there anything else I could do?

Doesn't look good. I'd do a water change (30-50%) just in case. WC's are probably the best cure for something like that anyway.

Is it okay to do a water change every day? I just changed their water yesterday due to their treatment? Thank you for the tip!

 

That's very ok. Until they get looking better, that's what I'd do.

 

A maximum of 50% water changes can be done at one time. After a few hours ( 4 or more ) we can do another 50% .
To answer your question.
Yes it’s fine to change water every day. Temperature matched conditioned water is the recommended replacement water.

quote.
” , we tested the water today and the ammonia level was down.”

A cycled tank has zero ammonia always. If the statement above says there is ammonia in the tank it’s not cycled.
However it’s also possible there is ammonia in the tap water?

 

A maximum of 50% water changes can be done at one time. After a few hours ( 4 or more ) we can do another 50% .
To answer your question.
Yes it’s fine to change water every day. Temperature matched conditioned water is the recommended replacement water.

quote.
” , we tested the water today and the ammonia level was down.”

A cycled tank has zero ammonia always. If the statement above says there is ammonia in the tank it’s not cycled.
However it’s also possible there is ammonia in the tap water?

Oh okay, thank you so much, I will do that until he gets better and will make sure to also check my tap water as well in case! Thank you so much again!

 

Gold fish exposed to subpar water conditions are susceptible to "Black Smudge". Blackened scales. It's a symptom that often indicates a parameter spike.