What kind of camera are you using?
I've seen a lot of pictures, but yours definitely stand out in terms of clarity.
My opal halfmoon betta was fine for a while & all of a sudden his fins started getting tattered.
I thought it had something to do with the plastic stem from the silk plant so I removed it, but I think he was ripping them out of boredom.
For my photos I switch between a basic P&S Canon 8MP & 12MP Canon.
Also how much do you feed him? He looks a bit thin in the 3rd photo.