What could this growth be - and best action?

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15NS

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Hi, Elsa is sick - I noticed he was lethargic and not himself about 2 weeks ago. Then he swelled up, and subsequently stringy poop - initially usual red colour, then grey-white.

He went into a hospital tank last Friday, with aquarium salt (1 tablespoon in 15 litres of water) and first dose of Interpret antibiotics. Small water change (c. 10%) and second dose of antibiotics on day 4 (Tuesday). Another 20% change today.

The swelling went down. Pine cone scales became apparent but have since gone flat again. Today thereā€™s this thing that is less a growth and more looks like itā€™s ruptured from inside :(

What is it, and what is the best / kindest thing to do now? Thanks for all advice and experience.

water:
pH 7.2
KH 10
GH 7-14
Nitrate 10
Nitrite 0
 

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Unfortunately not possible. Iā€™ve circled on the attached photo to assist
 

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If it were me, I would treat with another round of antibiotics and perhaps a bacterial med also...I like Furan-2. Continue salt and water changes. Look closely to be sure thereā€™s nothing parasitic in or around the growth. With it having a stem to it, it may possibly burst and go away. If itā€™s a tumor, it shouldnā€™t be a malignant one the way it is growing. Keep us posted. :)
 
One more observation...does it look like it is coming out of his anus? If so, it is a prolapse which may explain the substance inside. Perhaps poop. In that case, Iā€™m sorry to say it may be better to euthanize him. I use the clove oil method. Please let us know where itā€™s coming from.
 
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Hi Deanasue, thank you so much for your advice and Iā€™m sorry for the late reply. I only saw the first one for some reason and did as advised - and I canā€™t see anything parasitic- although any guidance on signs you would look out for are welcome.

update: there seems to be a really good response to a further dose of the antibiotic, more activity, eating (2-3 wafers fed individually twice a day), and coming to the surface when we open the lid wide or come to the floor and sit by the tank.

Then I just read the second message... It doesnā€™t look like itā€™s from the anus, itā€™s really more lateral and like itā€™s coming from the flank. (Which still doesnā€™t seem that promising if it was me Iā€™d not be happy!)
 

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