Yes, I would say now would be a good time for everybody except the small red ones, which are smaller than I would separate.
My favorite tool for this purpose is a regular bamboo chopstick. I unpot the plants, keeping them all together carefully, then holding the chopstick like a pencil, I work the soil out from in between the plants. Be patient when you do this (trying not to break too many roots) and be sure not to water immediately after potting them up. You should see close to 100% survival if you are careful.
