HOW FAST CAN I ADD MAGNESIUM

My bottle of ESV Magnesium says I can put 1.5ml per gallon until proper level reached....
If my little nano reef is 25 gallon and I discount for rrock....and I want to put say 15 mls in....how fassssst or how slowwwwwww do I put the 15 ml in??
Does the 15 ml have to be dripped in or can I squeeze 15 ml dropper into the tank all at once?
Please advise how you add mg....thanks, Tim
 
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