Growing Living Stones at 63rd Parallel North

this month i discovered that the 2 lithops plants with brand new leaves had etiolated. it means they had received too little light (8 h/day) and i began gradually lenghtening the photoperiod (daylenght) with my plant lamps. at the end of the month i had my plant lamps on for 10 h/day. i bottom watered and fertilized my living stones on the 2nd, the 7th (i didn't fertilize), the 11th, the 17th, the 22nd and on the 28th of february. the 2 etiolated lithops plants on the 7th of february the last lithops plant is finally splitting

i decided to start watering my living stones regularly twice a week. i spray them with water and every other time i bottom water and fertilize instead. my watering schedule for the month of november: on the 1st (sprayed), 4th (bottom watered), 9th, 11th, 15th, 18th, 21st and 26th. on the 11th of nov. i noticed that both of my argyroderma plants are changing their first leaves. almost all of the monilaria have already their 3rd leaves. they are growing very fast. my 2 conphytum plants or my 4 lithops plants haven't done anything yet. all of the containers have a lot of algae. on the 26th of nov. i noticed that the conophytum plants are also changing their leaves. my living stones are 3-month-old! towards the end of the month i began to lengthen the time between waterings and to reduce the light from the plant lamps to 10 hours a day. in the end of the month the temperatures dropped to freezing temperatures outside and the indoor heating started. therefore the humidity indoo...

the temperature is + 24 °C. i am decreasing the amount of light that the plants receive. the light is now on 12 h a day. the moisture is ok in the closed containers. i soak the monilaria container with diluted cactus and succulent fertilizer. i am currently (by accident) watering the monilaria every 3 days. what i mean is that the container seems to stay moist for a couple of days after watering. 22 of the monilaria seeds have sprouted and 2 of them are splitting (pushing new leaves through the cotyledon), 9 of the argyroderma have sprouted, 9 of the lithops and 2 of the conophytum. many of the argyroderma have turned reddish. the intensity of the light might be too much for them.