Thanks for response guys, so far just the bottom leaves, seem to have spread to a 3rd plant, with leaves displaying more patches.
no fan directed at plant, small fixed fan 100cm from floor pointing up
Grown in 1m x 1m tent, under 315w cdm, day temp 26degrees, night temp 20, effecting 2 different strains, killer glue and melonaid. Humidity is around 50. Growing in sohum living soil
first time grower with little/no exp, plants are 3 weeks old, 2 have started to display patches on the leaves. growing in living soil fed bottled water. can anyone help me identify what could be wrong