Hey Bud!
No need to add lime to growcoir, it’s got a nearly perfect pH balance as is! Soilless media mixes (like grocoir) are often void of nutrients, and are formulated to take heavier or prolonged nutrient feedings. Because of this, soilless mixes should be placed on a regular feeding schedule, making sure plants are receiving adequate amounts of plant macro and micro nutrients. Picking one nutrient line and following their recommended feeding schedule is one way to take the guesswork out of the equation. Aurora is an awesome, US based company that make a quick and easy starter pack for the beginner soilless grower. Check out the PDF link to their detailed feeding schedule. Find it here!
https://www.planetnatural.com/product/roots-organics-player-pack/
Hope this helps!