I use it (I'm using it right now), I've had only two seedlings have trouble with a hotspot in 3 years; one died, one I flushed the hell out of and it's fine now, so there's a small risk. Happy Frogs probably a better way to start them?
-good luck!
I use it from seed. It's easy to burn your babies if you overwater. But, as long as you let the pot dry out real good between watering, you will be fine. It has enough nutrients to last 4 or 5 weeks.