Can this be zapped less than 1000 sats?
Discussion
looks like not. I tried to zap you 33 sats 
No.
Minibits shows this if you try to enter <1000. 
Wallet of Satoshi will not let you edit the amount, only add more digits.
The message in Minibits is incorrect, it should be Mimimum payment amount ...
Will be fixed in the next release. Min/max amounts are defined by server hosting the lightning address (bancolibre in this case)