My daisy polyps like reasonably good flow. They apparently really dislike detritus on them, so even if it's in good flow, it would be a good idea to blast it off with a turkey baster during maintenance.
As a side note, mine don't like to spread over coraline algae. The rock they're on only has polyps where there's no coraline. I've seen them try to spread onto the coraline, but then the new polyp/stolon retreats.