Thanks yea the brown is nutes and great white most likely since we last spoke they did a complete turn around.  I used flushing agent and hydrogen peroxide.  Flushed for 1 day with just water.  Then changed water again and added nutes plus cal mag they doing a lot better.  They say for blue dream auto nirvana seeds say 65days feom seed mine are 40 days in from seed are 13 inches.  Roots still are not touching rez water yet.  This same thing happen with GSC auto I grew from nirvana and they said 70 days from seed for me it was 85 90 days from seed.  But thanks for help I have a top drip system and trying to get timing right.  Was twice a day for 15 min but got to dry so I now do 3 times a day for 15 min.  What is best timing for top drip I have 4 different timers ⏲️ 15min ones and I have the one that goes down to seconds.  Have not did tip drip in a while they are in 1.5 rockwool with clay pebbles on top so I don't get alge.  I think in 2009 I had it set top drip 1 min on 4 off do you think I should change it back to that.  Last few grows I did were aero with sprayers 1 on 4 off which worked good.  But I got tired of the sprayers clogging so I back to top drip just need good advice on timer.  It's very hard to wait for them to dry and set that way because some dry faster then others..so what do you think best times would be I would like to go back to 1 on 4 5min off 🤔