In my opinion that should be fine. The fox farm soil has some good nuts to start with and if your using fox farm nuts as well you should be good to go. Lots of people go that route. I would wait a few weeks before using any nuts and just let the soil feed your plants. Then when using nuts go half strength or less to start and ramp up as your plant gets bigger. I would also alternate between feed and water. That's just my opinion. I've read of other people going full nuts all the way through and then a two to three week flush. Some methods work for some people and not for others. It's all about the environment light (amount, spectrum), temp, humidity, airflow(wind), co2 levels, and most important tender loving care.