Dos si Dos Auto

Same situation with Wedding Cake. Everything ok but a bit slow at growth. Edit 21/3 (Day 17) : Watered with 2ml / L Bio Grow and 2 ml / L Bio Heaven, also i added 1 tab of co2 splitted in 2 bottles of 1.5 l. Totally i added 3 L of pure water to hydrate the soil and activate micro enzymes , and after 3 L with food. So 6L / 7 = 850 ml. Edit 22/3 (Day 18) : Added 400w MH to the tent so each plant take 58W more of 5000K. Led are at 3000K. Also increase distance to 90cm. Temperature increased by 2C also. Edit 24/3 (Day 20) : Watered with 1.2L pure water. She has some burn leaves, but i think its not serious , pure water for weeks will help.