Originally Posted by sarahm
I just changed his water after reading your post. I then googled Melafix and Betta, and people says it can kill Bettas. I feel so horrible that I have probably caused this. Thank you for your help.
I've looked into this and ime the risk is no more or less than for other fish (just in case google said). But I do find it can cause issues, particularly if over-dosed / not well mixed (which is easy to do in a small tank). Same as other meds and people use these fine with bettas but I find care needs to be taken.
So that was background thinking on trying him without the melafix, etc and see if he perks up (same as us really, meds can knock us around). Hopefully that helps. Also worth checking water chemistry for ammonia just in case if you have a test kit. Water changes frequently and small amounts (same temp), to keep tank clean. Large water changes on sick fish I find risky.