Had a plan of putting just an inch of water in my bottom trays for slight uptake as clay pebbles at bottom. Sort of to encourage root growth downward and cool medium ( soil ). Inch high pebbles in trays usually to keep bottom dried / airflow. Advisable or a terrible plan ? ..Autos 3 weeks old, LST biggest one today and thinking of giving them their 1st proper nute feed tomorrow morning, only being mixing what was left in Nitrogen cap after shaking whilst they were seedlings, all have 2 to 6 proper leaves now , which I will mist after sundown tonight then go 1/4 recommended bottle dose before going on the balconay tomorrow. Temp outside 28c , in shade...so thinking after just pouring small amounts 4 inches from stems so far, really give them a dousing tomorrow...1 ltr inc nute in each ? Any obvious idiocy in the plan ? 1st time outdoor Auto grower. Thank in advance for advice.