I put in the carrot already day before yesterday, so the advise was to let it sit in there. I came home today and saw it nibbling on the carrot I think. Seems to be pretty active and happy. It grew quite a bit from maybe say 0.5 mm or 1/32 of an inch to about 1 - 1.5 mm.
A little small to see but hopefully the next few days it'll be larger and easy to see / spot.