well ...whats the problem?...looks like they are doing fine...plants ALL respond differently...ur going to get dying leaves,yellowing,curling(try..B-1 and and a zinc and iron(for yellowing(chlorosis)((NOT SPOTS))...for us indoor growers,these plants are only gonna be around 5-6 months tops,chances are, you're gonna sail right thru these months without problems...HOWEVER...should u get spotted leaves...burned edges...or a sickass plant in general...FLUSH FLUSH FLUSH...and start over with just water(ph'd of course)