Leaves curling upwards and drying - please help!

Hey guys,

Can someone help me with a problem and the remedy?

I am using 250w MH lamp, just two plants, and the one that was doing the best just got sick. I am not venting the air because it's just a small grow, and it's my first one, don't know if that matters. Two weeks ago I gave it some flowering 10-30-10 nutes. When I did that, it got drying out and crusty on some leaves, and they started curling upwards. So what I did was flush it out, thinking I need to get rid of the nutes. Any ideas? Is this a ph problem? I don't have a ph meter yet, but I bought a ph meter from the pet store that reads only 5.0 to 7.6. The color indicated that it was below 5.0.

If that is the problem, how would I get rid of it? Just water it next time with some water that is a base, so like 8.0 or higher ph water?

Or, is this something that I immediately need to remedy - to flush with water with added base that brings it up to a certain ph? I don't want to lose this plant, and don't know what to do with it!

Here is a PH chart. It looks like you have PH lockout so you have get that adjusted before you can further diagnose the plant. For example you might have a bunch of magnesium in your soil, but if your PH is off your roots can't absorb it and it will show as a deficiency. If you add more nutes without fixing your PH it will do nothing but build up more unused nutes. I would flush it with PH adjusted water and add nutes accordingly. Keep your PH around 6.5 in soil.
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Sounds good - thanks.

Two questions:
1) What ph of water should I use? I don't want to burn my plants, and don't know the highest threshold I should use,
2) Should I just water with this - or should I flush it ASAP?

P.S. Nice avatar! HAHAHAHAH!

I would give it a good flush at 6.5 PH and start from there. Remember to test your PH after you add nutes because nutes can change PH.

Cool. Maybe what I'll do is test the water with the nutes in it to see what the PH is, then adjust it accordingly so it's basic. I think it was the nutes and the soil i used already had some minor nutes in it (like 0.18-0.16-0.15) so maybe it just was tending to be acidic because of that.

I just flushed it with water last week though, like 5 days ago. I am not sure but I don't want to drown my plant and have it get sicker by over watering it......

....just make sure it's 6.5 PH

looks like u r having heat issues also

yeah here is a chart so you can judge your lighting height... You definitely need to vent your air and keep it cool under that light.
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Thanks! I really appreciate it! Props to oJUICEBOXo and moash!

Its looks like a magnesium deficiency I had once. And according to Juicebox's chart magnesium would be locked out below 6.5.