I have read in a lot of places, 50% daily change of water in the first days!!!!! This will be my first demanding planted but i had 600lt of reef and all i ever did was 5 to 10% every two weeks! How much did you do in yours? And, sorry but as you probaly noticed english is not my mother language, what do you mean by crack co2?
Your really looking 50% for the first couple of weeks really. This is done as the plants settle. I did 50% everyday for 2 weeks, then done to 33% ish, on the third week, every other day. I'm now doing 25% twice a week, and it will probably stay that way for the tank life.
When I say 'crack' c02 I mean 'get it right' this means get the levels right and the distribution correct from the first day.