Tong feeding baby newts?

the baby newts are almost 4 weeks old and starting to become more like their parents. ( curious and playful) They are still hanging out at the bottom but come to the side of the tank to see what I'm doing. I managed to feed one a little piece of tubiflex cube using feeder tongs. The others were more afraid but this one was larger and already has his front legs.

I'm wondering if I should continue tong feeding or if it will stress them out. I want to raise them to be friendly to humans and get them used to freeze dried food. I live in Newfoundland and the pet stores have trouble bringing in live food particularly this time of year.
Is this too early to start tong feeding? I know there are some amphibian breeders on YA so your input would be appreciated.

http://www.newts.org/~swan/herps/caresheet.html

and

http://www.caudata.org/cc/species/Cynops/C_orientalis.shtml