I am new here (but been lurking for a long time), and just had to respond to this thread. It brought tears to my eyes to see the condition of that tank, and the mismatched inhabitants!! It brought more tears (of happiness) that you rescued Crimson! If I lived anywhere near you, I would be there helping you clean that tank and rescue the Bettas (and the rest of them).
Perhaps you could post the YMCA's contact info and we could bombard them with emails?? This, of course, after you rescue the other Betta's?
Anyway, good luck, and I look forward to many updates!
PS - at some point I will post a pic of my Betta (blue VT).