Great! Thank you very much.
Again, I'm very sorry if my thread offended you. See, I'm just dumb and I didn't check the other thread. :P Not your fault.
Annnnnyways... It looks like fin rot to me.
Originally Posted by DarkMoon17
Tail rot or fin rot
•Symptoms: Betta’s fins and/or tail seem to be getting shorter and shorter or they seem to be falling apart and dissolving, Black or red along the edge of the betta’s fins/tail, Bloody tips, Behavior may not change
Treatment: Conservative: Treat with Aq.Salt at 1 tsp/gal. Increase water changes to 100% daily. Replace accurate amount of salt following water changes. Add Stress Coat to help repair tissue. If there is little to no improvement within the first 5 days, you can increase the salt dosage gradually to 2tsp/gal but do not continue any salt treatments past 10 days. Medication: If Conservative treatment is ineffective use API Tetracycline, API Fungus Cure, API Triple Sulfa, OR API Erythromycin. Also add Stress Coat to help regrowth. Continue until fins/tail stop receding and start showing some new growth.
ALWAYS use the "conservative" treatment first. Medication stresses fish out, so you want to make sure that you have exhausted all other options first.
In a 1/2 gallon tank, you should be doing water changes every day. I personally would do 50% every day, 100% two or three times a week. Also, flakes cause ammonia to build up in your water faster than any other fish food. Might I ask what kind of pellets you used before? Have you tried multiple kinds? One of my fish won't eat Omega pellets, but will happily gobble up my cheapo pellets that came with my other fish's tank (to my despair... Ugh). Did it specifically say "for bettas"? Have you tried live/frozen foods? I've seen drastic changes in my sister's fish since I moved him from BettaMin flakes to frozen brine shrimp.