I haven't been on in a few weeks because I have been on vacation in Canada.
While I was gone I left my bettas in the care of my friend who was also watching my several other small pets. She called me a few days into the trip to tell me on of my fish had past away and when I returned the remaining two were in terrible shape. The water is brown, cloudy, and smells. I did a 30% change this morning, but it doesn't seem to be helping much. Should I do a complete clean out or would that shock my already ill fish?