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Medium size lump on archerfish pectoral fin


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A few days again this white lump showed up on the inside of one of my archerfish’s pectoral fin at the exact spot of some minor damage to the pectoral fin. If you were to lay the fin flat against the fish’s body the spot would also line up perfectly with where some damage to the fishes scales were sustained in presumably the same incident which I didn’t see. This injury directly on the skin of the fish was also super minor and got a similarly sized bump, which slowly went away. I am just alarmed by the location of this bump as it seems odd to develop on finnage, additionally it’s hard to tell but it seems less smooth.

Included here are some pictures of the curren bump as well as picks from bumps seen in the past which went away on their own. The ones with red circles are the old ones that have gone away.

I should also add that all these pictures and bump incidents are from the same fish oddly.

let me know what you think about this and what you think I should do about it! Thanks for any help you can offer! And if you have any questions about the tank or fish that might be helpful to you let me know and I’ll respond as soon as possible! 

Thanks so much!







Edited by Gannon
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On 1/10/2022 at 11:27 AM, HydraSlayer said:

Well, you said it grew on a wound right? Fungus tends to grow on wounds when not treated.

To clarify the wound had already healed completely, at least visibly. Also if it was fungus it would’ve gotten bigger or spread by now

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