white wid leaf probs

Hi All Im New Here And Must Say What A Good Site This Is.
Now I Have Some Probs With Me White Widow Leaves They Are Getting Little White spots and the very tips are going brown
Then They Turn Yellowish Only A Few Bad Leaves At The Moment
But I Dont Want It To Spread . Ive Been Told That It Has Spider Mites And To Get Some Spray For Them That Will Slow Them Down But Are They Making The Very Tips Go Brown All Help Much Appreciated

The Plant Is In Tomato Grow Bag Soil
Under 2 fluro tubes 1 cool 1 warm & 1 20w Energy Saving Bulb
But 4 More Energy Bulbs Should Be Here Soon,,, A Day Or So.
1, 80 mm Fan Blowing On The Plant With Fresh Air
Feeding With Canna Flaws 5ml Of Each Bottle, Mixed Into A 1LT
Bottle Of Water Which Has Been PH tested And The Plant Get`s a Little Watering Every Day

other pics>http://groups.msn.com/BUDBUD/mybud.msnw?albumlist=2