My new Porcupine Puffer doesn't eat...

[PufferPuffer]

I got a Porcupine Puffer baby yesterday along with a picasso...

but then...the poor PP seems like very very shy & scare of people...
always hides under the live rocks, swims away whenever i get close to the tank...
and when i tried to feed him awhile ago, it didn't even eat...
worring about it........><
what should i do?

BTW...
the pica got himself stuck in the live rocks last night...for like 8hrs...
good that he is fine right now...

>< 2 fishy...just 2 fishy...its alreay hard to begin with...><
i think i really needa spend more time to take goooooood care of them...