I guess I trusted the plant sellers a bit fast. Should have done the bleach-10%-water dunk when I got them. (I was answering my own question - "How could it have gotten in the tank in the first place?") In any case, it looks like I've got some decisions and some work... Or are they one in the same? LOL! Thanks very much for the direction. Coming back to aquariums after 25 years has been quite interesting.