Rule of thumb I follow: Germination and Seedling should see about 25-26 Celsius Day time and 60% RH w/ germination/vegetation night temperatures not dropping below 19-20 Celsius and the same 60% RH (roughly). What your plant is seeing in terms of temp(above ground) is not what your soil is seeing. If your medium is too cold and/or damp this will stunt your growth as roots aren't able to grow optimally under these colder conditions. Only when I reach bloom do I usually knock down my temperatures to 19-23 degrees (night and day). The temp you're running isn't bad, but I feel it could definitely be higher to help your plants eat and grow much faster. Vegging plants love their heat and humidity!!! (within reason of course) Hope this helped! You're not doing anything wrong and don't be afraid of making mistakes👌 in the future! You'll be just fine my friend. Happy trails👍👊