You absolutely cannot dose in this manner. As soon as VC hits the water, it starts to break down. It is totally gone within 8 hours. This is why we have to dose 2x/day.
Please be sure to read this before dosing VC:
VITAMIN C DOSING CHART
Here are the directions:
Use this product:
http://www.iherb.com/ProductDetails.aspx?pid=10178&at=0
$10 off coupon code: LUL789
To figure out how much to use, decide if you want to simply improve coral growth, spread, and color. If so, then you should dose around 5 ppm twice daily (down to 2-3 ppm works also). If you are having problems with coral or fish health, dose up to around 30 ppm twice daily.
Calculate the total net number of gallons in your tank (minus rocks, sand, etc). Enter that number here ______.
You will now need to do a little math. The amounts below are for 100 gallons of water so if you have 50 net gallons, cut the amounts shown below in half etc.
Dosing amounts using Iherb product:
1/4 tsp=1112 mg.
For every 100 gallons:
5 ppm ----- 1892 mg VC
10 ppm ---- 3785 mg VC
15 ppm ---- 5677 mg VC
20 ppm ---- 7570 mg VC
25 ppm ---- 9462 mg VC
30 ppm ---- 11355 mg VC
After you have figured out how much you want to dose at each dosing, enter that number here _____. This is your dose to be used twice a day.
Notes:
*Be sure your pH and alk are within normal reef limits before starting. Adjust if needed. Monitor weekly.
*Shoot for a ppm of around 5 or lower if only dosing for improved coral growth, coloration, and spread, also for better health/coloration of your fish. Shoot for higher amounts up to 30 ppm if you are having melting zoas or closed zoas and look for the causes of your problems as you dose. Higher doses of as much as 100ppm (for about 2 weeks) for fish illness. Check for high nitrates, pests, zoa pox, predators, and unstable water conditions.
*Dose low amounts and increase the amount slowly over the course of a few days to a couple weeks.
* If you notice an algae bloom (white stringy stuff) or increased scum on your glass then cut back by half until it disappears.
* Watch your skimmer, it will start to skim more.
* Dose the amount twice a day in a fast moving area of your sump or overflow. You may dilute the vitamin c in ro/di water then pour into overflow. If adding to sump, try and add the vitamin c after filtration such as skimmers and reactors. *Keep your Vitamin C bottle in the refrigerator. * If you have a question, ask here. I do my best to check these threads daily.
* The instructions in this guide and throughout this thread are based on using pure Sodium Ascorbate, not vitamin c pills and other non-buffered forms of vitamin c.
Be sure to take some "before" pics!
Will save you the trouble...