Do then look like these? ((top right corner))
Edit, would have helped if I would have attached the picture
If so, they are pretty darn hardy, and do spread like Travis stated.
As for acclimating them -- start them on the bottom of your tank, and slowly move them to where you want them -- may even want to shorten your photoperiod a bit, but I've moved mine from PC to MH with out an issue.
But, because they spread so well, may want to isolate them.