So my 2+ y/o betta is dying (I got him at Petco and who knows how old he was at that time). Doesn’t look like he has any disease, just started to get a little lethargic a few days ago, then refused food today and is now ‘fighting’ lying on his side or going nose down in the gravel. I can’t see any physical anomalies. The water is testing aok. I had to evacuate a 10G tank to put him in by mixing 3+ inch rainbows and 1in rasboras in one small tank. My question is, does anyone know of an incidence where betta’s come back from this point or should I just put him out of my misery? On the other hand, what is gill flukes?? Thank you