Need help PLZ......MN deficiency?

bigdave21

Member
Im not sure what is wrong with my plant i think its MN deficiency but im not positave i have not diagnosed a plant before.
I'm doing a hydro grow. Unfortunatly im using tap water. For nuts im using Botanicare PURE BLEND Pro Grow & Botanicare LIQUID KARMA I have 4 plants in 4 different 5 gallon buckets and all 4 plants are having the same problem also using 250 MH/HPS lamp 200CFM exaust temp varies from 75-85 humidity is 50-60 this is my 1st hydro grow.
leaf.jpg
This is whats happening to my leaves its happening to the oldest leaves first. the tip of this one is crunchy and i also just realized i have a small case of spider mites so i will also be asking for tips on how to get rid of them.
This was the worst leaf i could find and currently don't have a camera, so i pulled one off the plant and scanned it. getting a camera tomorrow. Anyway im just wondering if anyone can diagnose my plants

Any help would be appreciated
 
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