2 clones in a 50gal space tote

This first week was pretty rough. I originally started with one seed and one clone. The seed never sprouted because I think that I over watered it. So I went and got another clone so that they will be a little more close in age when it’s time to harvest.. day 1 I over watered and then as soon as it dried up 3 days later I over watered again. The leaves started to yellow and flop down . I spoke to someone at the grow shop and they told me that I’m using too much light and that I watered way too much. So I turned off one of the 2 150 watt lights and I drained all of the run off in the collection tray. Now I’m not watering until completely dry . I’ve seen a little bit of growth it’s been 3 days for the apples and bananas and that one looks good so far. Also Today I noticed white forming on the dirt around the sides of the flower pot? Is this mold? And if so how can I safely get rid of it? . After draining excess water and turning off one of the lights 2 days later The doc og is already starting to look better the leaves are turning up and I think I’m starting to see a little growth