I think the things with PERCULA is that by day 5-6 they turn orange, but in my batches white stripes aren't showing up until more like 8-11 days...at least that's what my gut tells me, I'd have to look for sure. By 2 weeks, they're ALL striped and swimming like little clowns.
Are you giving them BBS yet...I didn't catch that in my quick skim?
Matt