When To Start Adding Fertilizer To Pre-Fertilized Coco Peat

I bought those Coco Peat blocks that you just add water and it says has 20 grams of add fertilizer (20+20+20+TE).

I am going to grow from seed. I plan on veg for 1 week then into flower and using a 3 gallon pot (coco peat + perlite)

Now my question is after germination how long before I add new fertilizer or should I rather rinse the coco peat very very good to get out all the fertilizer then start from scratch?

Wait until you start seeing the first signs of deficiency (discolouration). This'll likely happen between week 3-5. Then use nutes 1/4-1/2 dose and slowly up it to full dose over the course of a couple of weeks.

-spek

Spek is right on the money, wait until you start seeing the first yellows than start with 1/4