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Red mark on ranchu


Huihui
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Hello, I'm new to this thread and have some questions about my goldfish. I have a ranchu and yesterday I notice a red mark/ scratch on his belly, and I'm a bit concerned. Yesterday I check it was a tiny mark and today it looks redder and bigger, I'm not sure if it's blood or anything. But he acts very normally like eating, swimming around and stuff. Should I use methylene blue or an antibiotic to help him? I'm also not sure if he just scratch himself because I have a bare bottom tank, I do have a filter with like the sucking part out and is not covered by a sponge or anything, so I'm not sure if it was the plastic part of the filter.

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Looks like an injury I would add aquarium salt 1 table spoon for 2 gallons and monitor for 1 week just remember to only put the amount of salt back in that you take out so if you do a 2 gallon water change put one table spoon back in if it starts to get worse  over the course of a week then I would treat with kanaplex 

 

Edited by Colu
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