Hey there
@bigguccigrower : what regulates the plants metabolism and how fast it grows is called the vapour pressure defict or VPD for short. This article presents the concept in detail : https://www.autoflower.net/forums/threads/vpd-vapor-pressure-deficit-explained.64510/ this one has the charts . Basically you want to hit the right ratio of humidity and temperature , what you can do to make that happen at this stage is to put a clear plastic cup over the seedling so it traps the humidity inside and helps the seedling grow. As the seedling develops you can remove the cup and lower the temperature... Hope this helps ! 🚀