Cold root temp? Are the pots on a concrete floor in a cellar or something?Really having issues with germination - dont know why. when I have grown in the past never had a problem. Ive put kaya, 3 La Divas, Critical Haze and another bubble under soil last night. None of them had long roots. Sweet Tooth is still in airing cuboard - being very stubborn to sprout. really annoying.

If you can afford it then yeh i would get CalMag and Alg a Mic the more the merrierGot Biobizz Fish, root, Bloom, Top max and Grow. Should I get a bottle of Alga Mic in ? Cal mag ? or both ?
Looking great just a little heads up on the llast pic.. The soil looks dry try to keep the soil moist/wet in seedling helps keep good humidity around the new sprout and they like it wet
Si