i hd this problem with some of my past bettas he had white spots im not really sure but try adding alittle salt to your lima's water im sorry thats all i know that helped my bettas
No stringy things. Here's what I did being that I didn't know the origin of this ailment:
I did a 12hr treatment of half dose treatments for all 3 spaced out 12 hrs using carbon filter in between to remove previous treatment. I did half dose because he obviously has no scales. I'm happy to say that whatever the problem was is getting better. Not sure which treatment helped....oh...and I did a 50% waterchange in between treatments as well to make sure the previous treatment would not adversely affect the next.