need some hydro help

well hello there world :)..

need some help before this problem persists.

ok so im on my week and 3 days of my new plants and there still on the seedling feeding schedule(they have 4 leaves plus 4 more coming out under neath them)

the thing is one of the plants two leaves got burnt/brown on the tips and all three have kind've regular green with a tinge of lime color on the leaves.

now i wanted to know because of the leaf count if there in vegetative stage now and thats whats causing the nutrient problem "looks".

some info: i have a 2"W X 4"L X 5.5"H cloner tent with

3 39w 6400k HO sunblasters 3Ft T5 CFL's

18hr light cycle: 10AM-4AM

its a custom hydro Drip setup which the plants get fed 4 times a day for 15mins

sched: 12pm-12:15pm, 4pm-4:15pm, 8pm-8:15pm,1am-1:15am

regular air circulation:

its a small desk fan that ive mounted on the bars of the tent

sched: on 12pm-4pm off, on 8pm-11pm off, on 2am-5am off

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there in rock-wool and when changing the nute tank should i flush the rock-wool also so they get the next nutrients instead of the old stuff in the cube plus the new stuff i just put in?.

i have a bunch of theory's on why its happening i just need to know exactly how to fix it.

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