Connie,
I don't know near enough about your tanks or corals to even try being definitive. I have 3 torches in a 45 cube (including a gold one a friend dropped off 7 months ago) and have not seen the dread brown jelly. A few corals have come and gone but the LPS seem to really like the low flow and moderate lighting on that tank.
My own experience has shown to tread lightly on dosing and back into water quality using changes and actually rotating salt brands. Sorry, mono brand salt guys, this works for me and my corals.
I think if you followed every Mfg'r suggestions on additives, you would end up with a Noxious tank full of chemicals and a thin wallet.

Are you real comfortable with the current parameters? Alk, Ca, Salinity, lighting, flow, etc? Vit C would be towards the end of my check list.
I wanted to add that I DO dose Vit C. I have NutriBiotic Buffered Sodium Ascorbate (Vitamin C) crystalline powder.
Comes in a 16 oz bottle. They claim there are no other ingredients and that its USP-FCC grade.
This stuff is added to my one weekly schedule though.