When is prey too SMALL for a T?

I recently bought 3x each of L. parahybana and L. difficilis. My LPS doesn't stock small enough crickets, so I bought extra adults to breed and have been feeding legs and pieces in the meantime. I now have about a hundred micro crickets, but am wondering at what point are they too small for a T to eat? My slings right now are between 1/3" and 1/2" leg span.

**to clarify**
I'm sure they can take the micros now, (I'll be feeding them tonight) but this is more about planning ahead.

---------- Post added 09-01-2014 at 06:00 PM ----------

These guys are smaller than I thought!

I feed dead and chunks of small crickets until they can take small live crickets. Pinheads should work fine live.

You can always just feed them smaller meals more often, as long as they can find the prey and have water/moist sub available to them then the sling can handle getting small meals. Besides crickets do grow at a decent speed so I'm sure you will end up with larger crickets before you can feed your slings all of them.