Indoor Calcium deficiency?

[Mainemedical]

Hey everybody, this is my first grow and my babies are 25 days old. I started noticing yellowing and browning at the tips of my leaves and I thought the problem was heat but I have fixed my heat problem and my tent stays around 75-79. I'm thinking that it is probably a deficiency in calcium or magnesium but I'm not 100% sure and I don't want to stunt the growth any by over nuting. I attached a picture below of one of them. Any info or feedback is appreciated. Thanks

 

[Muddy]

Welcome to AFN. Looks more like the start of a P deficiency but could also be a nutrient lockout situation if your pH is off. Have you been pHing your feeds and checking the pH of your run off? If so, what have the readings been?

 

[Mainemedical]

I had a ph problem the water I've been using is phed at 6.5 but the run off has been low around 4.5. I tried correcting the problem with a flush and returned the ph the about 6.3 for all of them.

 

[Muddy]

Did you give them a light feeding after the flush? Flushing leaches all the nutrients from the soil so you need to replace them. 6.3 is perfect on the pH.

 

[Mainemedical]

I haven't fed them anything since. What strength would you recommend? I have roots organic trinity and Buddha grow for veg nutes

 

[Mainemedical]

Do you think half strength would be too strong?

 

[Muddy]

Quarter strength should be good, see how they react and then up it to half the next feeding.

 

[User K]

I have a calcium def on one of my plants, it's more like yellow/brown rust spots on them, that looks more like nute burn to me as its started at the tips?

 

[Red eyed c]

Any chance of showing some pics mate,it's easier to help if people get a look at your plant. :smokebuds:
You may have done this already bro,but if not check out this thread from the infirmary https://www.autoflower.org/forum1/forum34/forum7/

 

[Mainemedical]

I gave my girls a feeding a few hours ago with quarter strength nutes. They did start yellowing and browning at the tips here are a few more pics, one of the same girl and another one I have going