Hi all, wondering if anyone has any input into what this could be on my betta’s chin. It’s like a lump or bulge in between his gills. Showed up a few months ago and has grown slowly but has stayed pretty much the same for about a month. He is still acting normal and feisty, eats great (betta pellets, bug bites, daphnia). He’s in a 5-gal filtered tank set at 78F. Ammonia 0, nitrate<5, nitrite 0, ph 7.