Need help... leaves not looking so hot

This is my first time trying to grow hydroponically and everything looks ok except about half of the plants have brown dead spots on the fan leaves and some are curling down and turning yellow:( I'm not sure what the problem is... I guessed it was an mg deficiency so I just bought some calmag plus. I then flushed each plant with a lot of pH 5.5 R/O water and made a new batch of nutrients and I'm hoping it will cure the problem... but I'm still not sure what the matter is? I was also wondering if I should just cut off the leaves that are curling down and turning yellow. Any input will be greatly appreciated :)

what kind of nutes? Lighting? room temps? humidity? ppms? Age of plants? etc etc etc :)

http://boards.cannabis.com/hydroponi...have-look.html
Here is a link to my grow thread :)

Thank you Weedhound for your response :) It's been about 4 or 5 days since I started to notice the problem and it is steadily getting worse. The good news is it's only affecting 3 out of the 14 plants that I have but I still want to save them if I can. Update on their status is pH 5.75, ppm 475 and res. temp 72 at day 28... temp in room is 77 and 42% humidity. I've been reading like crazy to try to find out what's wrong... what I've come up with is either nute burn or pH problems (most similar looking pictures to mine) but still not sure... I'm going to flush them again with pHed water and turnoff pump to see if their condition improves or not. Thank you for your time and here are some new pics.

classic fert burn

I'm not seeing classic nute burn symptoms- classic would be tip-burn, but this looks to me more like a fungal problem. Or possibly Ca def but I'm leaning towards fungus.

Hey everyone,
Thank you for the responses... Ok so what I'm doing now is continuing to flush the plants to cure the possible fert burn and I've got a fungicide that I might use if it's a fungus. I was just wondering how easy it is to get a fungus. I have a fan blowing on them 24/7 and venting out the old air into the attic. The temp never gets above 82 and humidity at 45%...and that's when I have to close the door. Is there any tell tale signs that it is a fungus? Thank you all for your time:)

Your water temps are slightly warm...that can encourage fungus probs as Stinky mentioned. Ppms of 475 certainly don't seem too high to me....if anything too low.....I'll check your grow log but would like to know what your ratios are with the cal mag etc.......info may be in your log.

I'd stop flushing things...if anything you are low on something....
how old are these plants and what kind are they?
how much cal mag are you using?

Hey Weedhound,
Ok ill stop flushing and put the pump back on the timer... I flushed three times with each time consisting of one gallon phed to 5.8...My reservoir had 12 gallons of R/O water so I looked at the firefox hydro feeding schedule and it said to mix 2 tsp/gal of grow big and 1tbl/gal of big bloom so I did the math out and got 120 ml of GB and 180ml of BB. Then I didn't want to do full strength so I did half... as for the calmag it said to use 5-10ml/gal so I use 5 and got 60ml for the 12 gallons (halved that too). So after the flushing of the three extra gallons it is at 15 now and the ppm is 420, ec is 835, pH is 5.75 and temp is 68. These plants are now 28 days old since the sprout broke through the rockwool and im not sure what kind it is... I got the seeds from a friend who grows outdoors (could that be the problem?). They are asleep right now but they still look good... they are still growing larger every day, like its growing away from the problem area. Ill post some pics tomorrow :) Later

That sounds good but you still may be low in the nutes somewhere. I'm not familiar with fox farm nutes so can't help you with that but with RO water you definitely need CalMag. During the later part of flowering I'll get close to 10ml/gal w/it for my hydro setup.

click on the link in my sig to my old grow log and in the first post I believe I listed the ppms of each thing I used.....I always use Calmag at 50 percent of the total ppms in my rez.

Yup as Weedhound said you ABSOLUTELY need calmag. Ca def can open your plant up to fungal infections!
I PROMISE that is not a fert burn. Seriously.

Hey Everyone,
The plants are looking much better... except the parts that were affected by whatever the problem was. New growth is fine :) and i just trimmed off all the shitty leaves. Here are some pics of everything.

More pics...

Wow, you have more plants than I thought. Hope that solves your problems.
Good luck. :)

Hey all,
I was wondering if someone could help me out by identifying the various problems I have here in the pictures. I'm still a little new with hydroponics but i'm going to guess that pic 1 is a light burn due to me foliar feeding with the light on, pic 2 I think is wind damage or something, pic 3 might be a sulfur deficiency, pic 4 ?, pic 5... Ca deficiency? Thank you :)

that's starting to look like insect damaage on some of those.....are you using anything for pests?

Look MSG...I'm sorry to do this to you but is there any chance you could restate your room conditions? I'm having trouble trying to remember your lighting etc....Could you put all the specs in one post I can sort of come back to...age.....weed....you know...

ligting, nutes, medium, plants age, room temps, rh, etc etc...it would help me out alot.

Not a problem at all Weedhound,
Right now for my first time I'm growing 14 unknown plants that are 33 days old (I got some seeds from a friend) in a 61"LX64"WX96"H closet. There is an AC duct that runs to the closet to bring in the new cold air and I have a 400w MH light (18/6) that is air cooled by a 275CFM fan that runs into the attic (going to put a carbon scrubber when I start to flower). The system I'm using is a hybrid of a couple of systems... right now I have it spray the plants for 15min every 3 hours while the light is on and I can plug up the tubes that run to the reservoir to make an ebb and flow ( I do this 2 times a day, 12 hours apart). It has a 16 gallon reservoir chilled with frozen bottles to 68-71F with a pH of 5.85, ec 1008, ppm 502. I'm currently using foxfarms 3 part nutrients (BigGrow,BigBloom,TigerBloom), calmag plus, and super thrive in R/O water. The room temp is 77 max and humidity is 42% right now. My medium is 1" rockwool cubes that I started them in, which are surrounded by hydroton in 3" net pots. Oh and i have a fan in there to move the air around. If there is anything I forgot to mention let me know. Thanks

Ok....33 day old plants....I'm complicated by your system so won't offer any comments on it....I may understand it after a day or two. :D

If I had 30 day old plants here would be the approximate amount of nutrients I would be using at that point ppmwise....I use different nutes than you but numberwise I don't things should be that different. I'm talking about plants being in veg here.

RO.....10-15ppm
CalMag....350
Pro gro 350 (veg nutes) (botanicare)
Liquid Karma....100ppm
Sweet 50-75 ppm

Should come up somewhere between 800-900 with 700ppms begin CalMag and grow nutes. (I do use Superthrive sometimes but it ends up being too much nitrogen if I use it with the pro gro)

I think you are fairly deficient on a number of things just because your ppms are so low. I'm assuming you are going by the dosing listed on the back of the package? i'm just not familiar with those so couldn't say.....

Hey Weedhound,
Got an update on the plants: All plants are looking fine except two that still have a problem. The problem might be cured because new growth is fine on those plants but the older fan leaves continue to get worse... I bumped the nutrients up to 775ppm and pH is 5.77 right now. Ive also topped/ tried to fim them to keep their height down and also tied some back to allow more light to penetrate the new shoots coming up :) I have scheduled a nutrient change for tomorrow because I have time and I was considering flushing the whole system with clearex and regular tap water (ppm 190 & pH about 7.7) to make sure there is no salt buildup. Do you think it will harm the plants? Besides all that I'm pretty happy with my first grow and I'm learning so much everyday :stoned: Thanks so very much.

good, watching the new growth is the key here....the older stuff won't get any better at all so don't go by that. Keep an eye on your ppms and see if they rise, go down, or stay the same.

You can flush out your system between res changes. It's always a good idea (although I don't do it.....shhhh) but make sure your water if ph'd to the correct level before putting it in your rez. Anything that goes into your rez should be at the proper ph, no matter what.

How are they growing in general? Fast? Slow? Sideways?