When should I begin adding CO2 and fertilizers?

I am starting up a new tank. Details are described here:

http://www.plantedtank.net/forums/12-tank-journals/1116658-new-54-gallon-new-co2-fertalizers.html

I believe I have medium-high light. I will be adding CO2 during the day. I plan to dose Seachem fertilizers, at least initially.

I made two plant purchases through this form and planted them 3 days ago. When should I begin adding CO2 and fertilizers?

From niceseol:
- 15 stems mixture of Rotala rotundifolia "blood red" and unknown Rotala - someone said they look like colorata, but I purchased them as Rotala macrandra
- 15 stems of Rotala rotundifolia
- 5 Rotala green
- 5 Staurogyne repens
- Java moss ball(golf ball size)

From bartohogL:
2 portion - Microsorum Sp. Lanjak Entimau
2 portions- Micranthemum Tweedei (Monte Carlo)
3 portions Staurogyne Sp. Low Grow
3 portion - Persicaria (Polygonum) sp. Sao Paulo
10 portions - Blyxa Japonica
1 portion - Ludwigia Sphaerocarpa Red
2 portions - Pilo Moss (like Queen Moss)
0 portions- Eriocaulon Father Duster

Current water is:
ph - 7.5
gh - 3
kh - 3
Ammonia - 0
Nitrite - 0
Nitrate - 5

Tank was cycled with established media and a few days of dosing ammonia prior to adding 3 very small platies. I will add additional fish 1-2 at a time over the next couple of weeks.