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

Related Reading:

(Price/1)Anti - bacteria Medicated Food Turt/aq Amphibians 4.5oz

Complete Guide to American Wildlife: East Central and North: Covering all Species of Birds Mammals Reptiles Amphibians Food and Game fishes Seashells and the Principal Marine Invertebrates Occurring Annually in North America East of the rockies and North

Zoo Med Aquatic Frog and Tadpole Food 2.0 oz

Live Food (Professional Breeders Series)

Eat This Bug: A Guide to Invertebrate Live Foods for Reptiles and Amphibians