Northern Lights Autoflower, First ever grow

This grow is held indoors under a Phlizon 1500W LED Light.
There are 4x 5 Gallon Fabric Pots filled with a Light Soil Mix from my local grow shop.
The seeds are from SensiSeeds Amsterdam.
We planted the seeds on the 27/11/2021 directly into the soil an watered about 100ml.
The temperature for the seedling phase stays between 19C-26C, the relative humidity between 65-90%.
Our grow space is an old shower that has been isolated with styrofoam an the grow walls have been covered in mylar. (100cmx100cm) We built a wooden wall as a front cover for our grow room an installed a door.
Above we have a 6 inch (10cm) inline fan that sucks air out of the tent when needed.
A small humidifier, dehumidifer and fan are also part of our system.
We still have to buy some kind of PH Tester for our water though.
Today is the 2/12/2021 and I‘m looking for any kind of tips or things we can improve