first cfl grow... problem with leaves, need quick advice please

Brown spots are appearing on the tips of my leaves and I'm not sure whats going on.

The plant is 21 days from seed. The ppm has always been at 1000 for the past few days and I haven't had any problems until now. (I am using CFL's with GH nutes -lucas formula- and he recommended 1000 ppm)

From what I've read, it seems like a calcium deficiency or ... just nute burn. Another other opinions and what I should do?

I'm a bit low on nutes so I'm reluctant to do a flush. I plan on just diluting the water for now to see what will happen.

Plant seems fine in general


Some leaves that are growing straight down/curling?


the spots..

you should not be feeding at all. It was best to wait at least 3 weeks before feeding them. If you dont want to flush, give them water only for the next 2 weeks.

If your using RO h2o, you'll need some cal./mag. using the Lucas formula from my exp. with it.

...what is your growing medium?

Its a dwc bubbleponic system (tap water, with general hydroponic hard water series). is cal mag necessary? or will the problem go away by itself? I'm kind of strapped for cash right now and I'm trying to save money where I can...

How long has this problem been going on? - 2-3 days
What STRAIN are you growing? - Lowrdyer 2
What was the establishing technique? (seed or clone?) - seed
What is the age of your plants? - 21 days
How long have they been in the soil mixture they are in now? n/a
Were they in the same mixture when they were seedlings/smaller plant? If not, what mixture were they in before? n/a
How Tall are the plants? about 10 inches
What PHASE (seedling, vegetative or flower) are the plants in? -flowering
What Technique are you using? (SOG, SCROG etc) - DWC, bubbleponic
What size pots are you using? (Include how many subjects to pot) - 1 gallon bucket
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?) - n/a
What brand Nutrient's are you using? - General hydroponic 2 part (lucas forumula)
How much of each nutrient are you using with how much water? *Knowing the brand is very helpful* -ppm is at 1000
How often are you feeding? -
If flowering, when did you switch over to using Bloom nutrients? a little less then a week ago
What order are you mixing your nutrients? (example: veg nutes 1st, bloom 2nd ect) - veg first, bloom second
What is the TDS/EC/PPM of your nutrients used? - pH constantly at .6-5.9
What is the pH of the "RUN-OFF"? - ?
How often are you testing pH/ppm/EC/TDS? - everyday
What method of pH test was administered? Using Strips? pH pen? - pH pen
How often are you watering? - everyday with 5.7 pHed water
When was your last feeding and how often are you feeding? - I did an addback a few days ago
What size bulb are you using? - (5) 42 watts of CFL
How old is your bulbs? - new
What is the distance to the canopy? 3 inches
What is your RH Factor? (Relative Humidity) -45
What is the canopy temperature? 75-77
What is the Day/Night Temp? (Include fluctuation range) 69-77
What is the current Air Flow? (cfm etc.) - 50 cfm (exhaust)
Tell us about your ventilation, intake exhaust and when its running and not running ? exhaust
Is the fan blowing directly at plants? I have another computer fan blowing at it
Is the grow substrate constantly wet or moist? no
Is your water HARD or SOFT? HARD
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? TAP
If using tap water, what is the ppm/EC/TDS of the water right out of the tap?(Only if you have a tds pen) 230
If using RO,Distilled,mineral water, what is the ppm/EC/TDS without any additives?(Only if you have a tds pen)
Are you using water from a water softener? n
Has plant been recently pruned, cloned or pinched? no
Have any pest chemicals been used? If so what and when? no
Are plant's infected with pest's? no