Oh, I also wanted to mention that I have had major shredded fins occur
when I'm not carful with ph testing. My tap water is more alkaline then
my tank water so if I'm not careful and change too much water (50%) the
pH levels fluctuate more then the .2 safe range. That's when I notice
shredding on my old betta.
I actually haven't heard anyone verify that pH fluctuations can cause
shredded fins so I can't say for sure if this is true, but I have seen
it a few times now and it's consistant with pH fluctuations.
Maybe someone can verify or discount this theory for me. I'd like to