i have 400 wat lights space is 3ft l 4ft w 7ft t 2 pots 12 inch tank for holding water is 20 ltrs basicly what i need to know i have now sprouted the seeds im about to put them in the rockwool do i leave them soaking in a small tub with about 3 inches of water untill they grow a bit or do they go straight into the system and how often should i flood them and how long for all help is much apreciated