All for Reef by Tropic Marin ballpark estimate for 30 gallon mixed reef?

[duganderson]

Any ballpark estimate of how many ml of All for Reef a 30 gallon mixed reef of softies, LPS and a couple sps would use per day?  

 

Based on what I estimated from what I read, it would only use about 6 ML per day which would only cost about $25 per year if I'm using the large $75 dry bottle.  Am I doing the estimation and math right?

 

Does the dry powder expire because one large powder contain would last 3 years if my esimatation and math is correct?

 

Thanks!  Doug