are my plants ok?

topsecret2012 said:

plants were from seed, germinated on 17/02. 600w hps, rockwool, clay pepples, water 4 times a day for 15 mins. ec = 1.57, ph = 5.8

3 of the plants have curling tips and 2 have leaves which are curling inwards - its hard to see on the pics but the one top right is worst effected

ive lowered the ec today to 1.4 and left ph as it is. for the past 3 or 4 days ec gas been rising to around 6.2 overnight - i then add water in morning to bring down again. ph was going up for the first few days now its going down - ive adjusted using ph up

from researching i think i may be over feeding and or have too much heat in room - average temp with lights is 27 although small room with 4 inch intake and 5 inch outake, set at max with desk fan on with lights

any help would be much appreciated

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