Sick Guppy?

~heidi~

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I was looking at my fish today and noticed that my favorite guppy has grown this yellowy "lump" on its back. It was not there yesterday and he is eating fine. I have separated him from the rest of the tank and am wondering how to treat this. 
Thank you very much for any help. I am very worried about him.
 
The rest of the fish in my tank look fine.
 
 
 

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Blitz

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Perhaps it is a cyst. Is it growing bigger and does it affect him on any of his abilities(swimming etc)? 
 

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