Yeh,just water them.You can tell by picking up the pot,when they need water.As for bloom,you can start adding it on the 2nd week of flower,along with the veg nutes 1/2&1/2.
could have a bigger pot,add some gardenlime,They look hungry,.Also you can add some blue light to the room,Like a 6500k cfl,if your hps bulb does'nt have a blue spectrum.
I always toss,any strains that start getting mildew.Grow mildew proof strains.BBCheese,superlemonhaze,afghani#1,lemonskunk.Those are some I've grown that are mildew proof.