Probably still stressed. Give them a week and then start getting worried. If that does happen, then maybe try offering frozen foods, or some way of another enticing treat. Were they eating when you bought them?
So if I have this right you added quick start and in 3 weeks your ammonia, nitrite and nitrate were at 0? Do you have a test kit and can you test all 3 of those again? Were you adding ammonia or did you have any live stock in the tank during your cycle period?I think I started my tank 3 weeks ago, well that's when I put the gravel in and water, at first I used bacteria supplement, which did not work at all. So I switched to quick start by API. I put in my plants and wood and such I think 1.5 weeks ago I would say. So it took about 3 weeks or so too cycle. Everything was at 0 before I put in the fish so I thought it was going to be OK, but then when I did put in my fish, my nitrite had a spike, going into a .1 or so. I have been putting in more prime and such, it has been going down a little. I am thinking of doing a water change or just letting it go back down.
Exactly where I was headedTry pea's and or garlic soaked food. Make the garlic minced and add water and let some food soak up the juice and apply to the tank. Don't be cheap and buy minced garlic at the store.
I am with @Dman911 on this... it is great you added the bacteria starter but without any food it would have gone no where quick. Food being ammonia from live stock, rotting food, ammonia drops, ect.