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Can anyone give me a site that I may be able to reference a fungas by photo displays?

My problem.... Growing 30 plants under (2) 1000x HPS. They are now 26 days into flowering and 4 feet tall. Their growin strong with wonderful bud sites but about a week ago a few plants' leaves started turning brown and yellow at the tips. Lights are 3 feet away, plenty of air circulation and I...