Growspace is surrounded by styrofoam already ... lol i'd need tons of ice! I could use those plastic camping "ice" but they stay cool a few hours only i should change them many times a day... heat will be higher when lights are off, during the day, nights, when lights are on, temp won't be higher than 26/28 celsius. I just started one month too late. Hope i will be able to manage it. Btw, if i had grown them under sunlight, during daytime temp would be much higher. Thanks bro for your support. Going to feed them now with 2cc/liter biobizz blooming nute.. see ya