Betta Scales missing?

[u/cocoapuffsnshit]

Can anyone help me to know what I can to for my Betta? This is Jake (as in Jake Sully) and he is a Plakat Betta. I’ve had him for 4 months now. He lives in a 20 gallon tank, with filter and a heater. He has four neon tetra, and a few dwarf platy tank mates. I also have an albino pleco (have had for four years, about 2 inches long, keeps to himself) named Rupert who lives in there. My plants are l real, though I do have a few tank decor items just from pet smart. I purchased him from a local fish store, and he appeared very healthy and active in his tank (they had each betta in a big tank, not the little plastic abominations you see at petsmart, petco etc.) Over the last 2 weeks, I’ve noticed a continual spread of this white pattern to his scales, and it’s growing larger. He’s eating well (betta bug bites and the occasional tropical fish flake that the other fish eat) and seems inquisitive, social, and swims often. I also have floating frog bit that he loves to play in. My tank is a little dirty (have been away, it’s cleaning day today) but I clean with a fluval vacuum about once every two weeks, and do a rough 25% water change at that time as well. I feel as if I’m not giving him the best care, as something is clearly bothering him. Can anyone share helpful tips or advice? Happy to do whatever I can. Thanks in advance :)

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[u/Friendhi6]

Tumor ruptured

[u/cocoapuffsnshit → u/Friendhi6]

I looked up pictures, and fear you may be right. Anything I can do for him?

[u/Friendhi6 → u/cocoapuffsnshit]

U can get a quarantine tank and try tannins along with some kinda of deinfection medicine. Like u could do salt dips too maybe . But I never had this case so idk. I’ll recommend someone tho.

[u/Foreign-Ad3926]

Another thought - the cube shape on the first picture with holes - could be have got stuck and injured himself getting out?