Watering problem ?

I GOT TOLD THAT I AM WATERING MY SEEDLINGS TO MUCH AND THAT IS CAUSING THIS

( SEE THE LEAF TIPS)
..


SO WHAT CAN I DO TO FIX THIS ------------------
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ALSO,

I GOT TOLD WHEN I PUT THEM INTO THE HYDRO

TO HAVE THE FILL TRAYS TO COVER 3 QUATERS OF THE ROCKWOOL DURING A WATER

AN THE TIMER SET TO DO THIS FOR 8 MINUTES EVERY 2 HOURS ( APART FROM LIGHTS OFF)

I WATERED THE ROCKWOOL THAT THESE PLANTS ARE IN ( YESTERDAY ) AND THEY ARE STILL WET,

SURELY IF I FOLLOW THE HYDRO WATERING TIPS I HAVE BEEN GIVEN THIS WILL ( OVER WATER THE PLANTS) ??????

IF I SOAK THEM EVERY 2 HOURS FOR 8 MINUTES, IT WILL COMPLETELY ( DRENCH) THE ROCKWOOL

PLS HELP WITH THESE TO QUESTIONS

You should adjust your pot / water so only the very bottom of the rockwool gets wet (1")
Also - I only flood every 6 hours for 15 minutes while lights are on only, and that is for large fast growing plants.

Okay, thanks will do,

yesterday, i got an empty rockwool cube 3"

and put it in a tray of wtaer , 1 inch deep,

after 5 mins it pretty much soaked itself

so yer, ill try that