My plant is dying! Please Help!

My plants appear to have some sort of deficiency or problem the leaves are getting yellow spots and brown tips the top of my runt plant was so brittle around the bud leaves that I cut the top off. Any advice? they are indoor under 400w hps fead with Miracle grow bloom boost about once a week-week and a half. I have been leary to give them too much for fear of nut lock. I have a few top44s and some unknown strains also. Here are the pics

I had the same problem and it was over fert, but then others would tell you it could be overwatering or the ph
also could be a magnesium def you should go through the def tables again and match the symptoms

im not a expert! But from what i understand, during flowering, the plant will have a natural nitro. def. cause the plants are using up whats left in em', b4 there death! So, if thats the case ur good, but if not, go2 www.icmag.com/ they have a huge section on reconizing, and treating diseases (though u will have to search a lil).

wat are ur temps like???

temps are between 70-80 degrees I tried to go without watering them unless absolutely necessary and quit feeding so much but they just keep getting worse. the ph is about 7.5 average

7.5 is verrrry bad for u plant mabn get it around 6.1 - 6.6

drop that ph level... thats a basic level... should be round 5.8 or slghtly acidic

ok well i used vinager water to lower it before and that was around the same time i had the problems start any other ways to lower it?

i had the ph at about before but i was afraid i might should have left them alone i didnt want to hurt the roots

hollandsfinest said:

im not a expert! But from what i understand, during flowering, the plant will have a natural nitro. def. cause the plants are using up whats left in em', b4 there death! So, if thats the case ur good, but if not, go2 www.icmag.com/ they have a huge section on reconizing, and treating diseases (though u will have to search a lil).

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Fans that die naturally during late flower do not look like that. Those look bured.

I say flush like mad with distilled water, about 3x the volume of your containers. Whether its a ph issue, or nute burn, this should help either way. When in doubt, flush it out.

yeah im sure its not nitrogen deficiency ive been through that before. these have yellow spots and white or yellow tips

but if it is a deficiency wont that take whatever it already has flushing it? Its only got like 3 weeks to go so i hate to give it much more plant food i want it to be clean at harvest dont you think?

Well if you're 3 weeks from harvest there shouldn't be any nutes in the soil anyway. Flush my good man, flush away. Your plant will use up its stored internal nutrients in the last three weeks.