Why do I have this Magnesium def.?? I have tried everything!!! PICS!

Ok guys, I got some blackberry kush that have been Mg deficient for a while now and I can not figure it out. I just moved to a brand new area and am unsure of the water quality, it's in the mountains so I figured it would be better than in town but I'm not too sure. All I know is that the ppm is about 230. I also have new cuttings and small potted clones someone gave me and within 24 hours of me watering them they stems have gone purple and they are starting to go downhill as well. I ph to 6.0-6.5 every watering. I had them vegging in 7 gals filled with vermifire for about 4 weeks without feeding as I was told this soil was "hot" with nutes. They have only been fed twice with botanicare line at suggested increments on the label. I fed cal/mg the last 2 feedings and have not seen much if any improvement. Do I need an r/o filter? Is there too much CA locking out Mg?? I don't know what to do, tried foliar spray with MgSO[SUB]4[/SUB] (mag sulfate). May have over watered once but it just has not gotten better!!! Any help greatly appreciated guys.

[FONT=Arial, Helvetica, sans-serif]How long has this problem been going on? weeks
What STRAIN are you growing? Blackberry
What was the establishing technique? (seed or clone?) CLone
What is the age of your plants? 60-70 days
How long have they been in the soil mixture they are in now? 6 weeks
Were they in the same mixture when they were seedlings/smaller plant? If not, what mixture were they in before? same
What size pots are you using? (Include how many subjects to pot) 7
What substrate/medium are you using? What brand of soil mixture are you using? vermifire soil
How much of each nutrient are you using with how much water? Botanicare grow/bloom/liquid karma/cal/mg
How often are you feeding? once week
What is the pH of the "RUN-OFF"? 6.5
How often are you watering? every 5-6days
What is the canopy temperature? 78-80
What water are you using? tall boy de-chlorinated
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Have any pest chemicals been used? If so what and when?
Are plant's infected with pest's?
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no one?? bump

It's not a science buddy, just got to find what works for you. Me I feed/feed/feed/feed/ my clones till they ask for water, which isn't very often, and your PH for soil is off. Here again I don't PH my water anymore because it's a perfect 6.7...but soil needs to be between 6.5 & 7.0. Just try mixing up some 3/4 strength nutes and feed the fuck outa them till there's plenty of runoff, and I add Epsom salts to my nutes about a tablespoon per gallon each feeding... good luck

I don't use to much cal/mg with botanicare and tap water...maybe you might be gettin some toxcicity, flush it out and lay off the cal/mg, ur tap could be super hard water as is

I would wait till they need next watering then flush with H202. I would then leave a couple of days then give feed with good N ratio. Not full feed, gradually build feed back up. I've never heard of Vermifire so not sure what its like. Looks like over watering to me that could have caused nutrient lock out causing issues but no matter the cause that's what I would do now.