brine shrimp, spinach, algea food questions

Hey all,
a few questions about brine shrimp and spinach for a reef tank.

1) I cannot even see the brine shrimp with a magnifying glass, how do I know
they are hatched after 48 hours in water/salt/light/air flow? I see stuff,
but don't see it moving.

2) Can you raise brine shrimp to be bigger, so instead of feeding feeder
fish, use larger brine as feeder? How can you raise brine shrimp? Keep
them in water with air flow and light?

3) How long do you microwave spinach before placing it in the tank? Should
it feel soft and mushy? Or hardened?

4) Can I place a 1 litre coke bottle full of tap water in the sun for a few
days, then feed the "green" algae / water to the tank?

Thanks for you help!