Yea, N.crawlers are cheap and are a good source to bulk them up. My columbian flowers are picky eaters. My male decided he would be the first one to actually consume a n crawler and not just swim over it. The male and female would juice the small pieces of n crawler but not eat fully. Now, both of them are now taking and completely eating n crawlers,yea! (took them a month to come around,hehe. But,then I've only had them for alittle over a month)