people have varying opinions on what is needed but what nthompson said is a commonly used schedule.
you said "I am wondering if the Reptivite will suffice for the vitamin and D3 requirements?"
never used the reptivite, i personally dont like using a multivitamin. i have used stickytongues and nekton. and i think thyre much better off with a proper gutload than with potential over supplementation. hence why people only recommend using a multivitamin 2x a month.
considering its recommended d3 and multivitamins be used twice a month you should be fine using the reptivite just the same. 2 times a month.
i use d3 once a week, so 4x a month but very little.
theres more than one way to skin a cat.
im just wary of vitamin supplementation when you can just gutload and be safe(er)