Plant seems healthy and is growing but all new leaves have yellow tips!

Medium: Low nute "professional grade" soil (.09, .04, .06) mixed with sand and perlite - 2:1:1.
Lighting: All CFL - 1-125w (6500k), 2-42w (6500k) & 2-42w (2700k) = 293w CFL total. About 3-4" from plant tops.
PH: Soil - 6.8. Water - 6.8 (tap water - adjusted with apple cider vinegar and left out for 48 hours before applying to plants)
Temps- 77-84. Thermometer with remote sensor positioned a little higher than plant top level.
Nutes: None

Note: Bottom leaves were salt burned. It was flushed yesterday and all new growth has yellow tips - only yellow tips. All other growth is green besides the tips. Should the flush take care of this? I'm not sure what else I could do. On paper everything seems to be right.
kennbuds Reviewed by kennbuds on . Yellow Leaf tips... Please help! Plant seems healthy and is growing but all new leaves have yellow tips! Medium: Low nute "professional grade" soil (.09, .04, .06) mixed with sand and perlite - 2:1:1. Lighting: All CFL - 1-125w (6500k), 2-42w (6500k) & 2-42w (2700k) = 293w CFL total. About 3-4" from plant tops. PH: Soil - 6.8. Water - 6.8 (tap water - adjusted with apple cider vinegar and left out for 48 hours before applying to plants) Temps- 77-84. Thermometer with remote sensor positioned a little higher than plant Rating: 5