Betta Fin Loss With Red Patch

Hi Kv,

If your betta is prone to sitting on top of the heater, it probably would indeed be a good idea to get a heater cover, to prevent any likelihood of him burning his fins.

There's another few threads on here involving a betta with similar symptoms to this - but it may not necessarily be the same as what that betta has. Before we make a definitive diagnosis as to whether this is a heater burn or something else, and then try to help you further, could you tell us a bit more about whether your betta is behaving and eating normally, or whether he's sitting on top of the heater because he's clearly much less active than usual? How long has the top of his fin been that colour - always or just turned that colour today (or are you not sure whether it might always have been that colour)?