I wouldn't bother, trust me they're going to spread all over your tank! Took my blue ones maybe a month before they started spreading/moving off the frag onto the rocks. Then I moved the frag to another rock across the tank & they did it there too. The red ones took about a month to start letting go of the frag & blowing around the tank to attach all over the place. When they liked the location, they'd start moving over a little bit every day & leaving babies behind. No feeding required, just patience for a few weeks!