Brown tips are usually caused by fertilizer burn, but you say no fertilizer. What type of water? They are extremely sensitive to mineral buildup (thus very little fertilizer.) Mine are watered with pure water (RO, distilled, rainwater, etc.) with no included minerals. Tap water will cause the brown tips. While they like to be kept constantly moist at the roots, dripping water is a no-no. If you can manage it, try using RO or distilled water with a very weak fertilizer every 3rd or 4th week (mix the fertilizer to result in 125ppm nitrogen.) See this web site
Fertilizer PPM Calculator Hope this helps.
Temperature is not all that important for leaf growth. Mine get up to 70s F at night and 80s F during day in summer. They just are reluctant to bloom under warmish temps.
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