Plants are 3 Cindy 99's in 5gal ffof. Lighting is a 400w hps roughly 12" above tops. Temps stay in the upper 70's to low 80's with lights on, and low to mid 60's during lights off. Humidity varies from the teens, up to low 30's.
All 3 have leaf tips curling down, and a few leaves that are canoe shaped. 1 is the worst, 1 has a little less, and 1 is only a couple leaves here or there.
I go by what's on the bottle. I usually start off at a quarter to half strength, and work up. I measure with a syringe. A ppm meter is next on my list of things to buy.
I mixed my res with 1 tbsp per gallon, but did not get to do a full flush. My Goddaughter was brought over and I didn't want to wake her with the shop vac, so I only got to run about 3-4 gallons through each 5gal bucket. Ended up vacuuming out just over 2 gallons on run off.
Plants seem to be doing ok. Feeding at 1 tbsp per gallon for now, and will start stepping up the bloom nutes in the next couple feedings. Changed my lighting schedule to 13/11 a few days back on the 21st. Hoping that the extra hour of light will extend the flowering time slightly, and allow the buds to put on a little more weight to help make up for the n-tox, and my timer screwing up, and only giving the plants 7 hours of light a day for the 1st 3 weeks of flower.