Truthfully you can switch if you like but it will kill the biodiversity in your living soil, I myself switched to 20-20-20 as soon as I got them outdoors and they're thriving hard and huge, some of the biggest plants I've ever grown to date. But I guess it boils down to personal preference and how much time you have to take care of them as well, using Gaia is set it and forget it for a month and with 20-20-20 you have to repeat every 4 days or so. Depending on what you want and how much time you have it's up to you but NO it won't hurt the plants if you do decide to switch it over, best of luck