Just started running 3 mages.

Last 8 level all I have done is main has fireball spell 2 other mages have /cast [target=focustarget] Fireball. Was thinking should I make the main have macro also using /castsequence?

like /castsequence Frost Bolt, Fireball?

That way the mob is slowed. Right now more or less killing everything before they get a swing in most of the time.