I'm a newb and I started a clone in MG with nutes and I didn't burn my plant but you can pick out the nute balls if you want, to kinda help decrease the amount of nutes your plants get
don't go with organic because I have red alot of people has ended up with bugs using Organic Soil and besides some people start growing in soil with nutes in tit when the plant is a seed / clone so by the time its feeding time all the nutes are gone
well if you can make one of them grow fast then harvest it then you should be fine but give the other plants less light so that they will grow slower then the one with more light