They look fine to me. I've grown them from seed and the babies weren't very temperamental even with some neglect at times. They didn't stay inside very long though. I always worry about damping off on seedlings of any kind when they are indoors. I've never used grow lights, but that should be a good option for canna seedlings, I would think.
Did you scratch the seed surface before planting them? That was a chore! I finally used pliers and a grinder wheel. 100% germination on those

. They were ugly, but some are still hanging around anyway.