Caring for Macro Algaes

[beefchicken31]

Is there any good links for macro algae husbandry?

Do they require pruning?
If you prune too much back will the "plant" die?
Do they require ferts?

 

[beefchicken31]

Also whats the ideal spectrum for MA's?

 

[beefchicken31]

also is it tue that MA's will die if they have no nitrates? If they absorb nitrate, how do you know if they are getting enough?