Aww nice post, I had a Betta fish once, it was purple, but he got sick of the eye, the eye seemed like it was going to explode. I tried to save him but it was impossible. Yes they are very grumpy fish, I once bought him 2 more fishes (regular fishes) for him not to be alone but I had to take them out to another bowl because he attacked them since I dropped them in his aquarium haha. Very beautiful and grumpy fishes!
Thank you Mari,
I did some research and what you describe is pop eye and can be treated with antibiotic for aquariums.
The disease is caused by bacteria. I had a similar experience. My fish got bloat after introducing mollies to the tank. It looked like all the scales were sticking outward.