Happy new year, everyone!
After my post yesterday about Alex's torn tail, I've been watching him very closely. Thanks to taking a few pictures of him, I can track his progress, and it looks like his tail is knitting back together very nicely at the places where it tore!
With good water conditions, a healthy betta can heal simple injuries very quickly, and I'm so glad that this has been the case for Alex. Poor little chap! I think tonight I'll give him some frozen-thawed bloodworms - his favourite!
As I went about my daily check of Alex and his tank today, I noticed that the poor little guy had a couple of nasty splits in his tail fin! While this is quite a large area of injury for a small fish, in my experience, this pattern of damage on a fin is characteristic of mechanical damage. The specific type of damage that I see is:
You will note that, while the very lower tip of his tail fin appears darkened, this is a part of his natural coloring that I was already familiar with (from my daily checks!) - it is similar to the blue edge on the bottom of his anal fin.