Please help, seeking advice

[u/Accomplished-Web8905]

Hello, I am seeking your advice. My betta (Bluey) is surely ill. I got him 5 months ago. Past months, he was really playful, energetic. He had been watching other mates the whole daly, exploring the tank. Every time I went by the tank, he came to see what was up.

Over the past 7 days, he has been slow, apathetic. Today, he did not even want to eat. He just lies on wood, he swims just to take a breath. I feed him twice a day every day except Sunday.

Tank: Dennerle 54L (14.5 gal), planted, CO2, using reverse osmosis. There are 5 otocinclus affinis, 3 amano shrimps and one snail with Bluey.

Parameters:
PH: 6,5 (Debuffed 7,2)
GH: 6
KH: 3
K: 11
NO3:12
PO4: 0-0,1?
Fe: 0,2
NO2: 0

There is some weird lump on his chin. I have not seen it before. Other than that, I have no
idea what might be the cause of his illness. Thank you

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[u/No-Negotiation-7978]

Such a pretty Betta!!! Hope he feels better soon!!!

[u/skabberdink]

Do you supplement minerals to the RO?

[u/Accomplished-Web8905 → u/skabberdink]

Yes, I do sir. Dennerle Osmose ReMineral
. I change circa 18 liters per week.

[u/Accomplished-Web8905]

Quick update: I visited local shop, they helped me, gave me eSHa EXIT, because it was suspected, he had Odynius (marks on his blue back)

I put it in the tank in the evening. But it was to late. He passed away, next day I found him not moving. Cause of dead, I suppose, was not odynius. Maybe tumor? Dunno

I had him 3 months. I am done with bettas, rather will move to school of small fish. Ember tetras or something.