ZuRaf

Hi all, Ive received from a vendor 4 months ago 3 helis (uncinata, minor, heterodoxa X nutans). the existing pitchers are keep getting dry/burnt while no new pitchers are appearing. I am growing in an indoor cabinet with a fan constantly operating. Please see below the growing conditions and some pictures. If that's a fungi problem, any product to recommend? Thanks so much for any help! :) ROL>95%, 23-20degs typical temperature with 26degs(max day)-16degs(min night), light 392PARS, watering every 3 days from above, soil mix perlite peat moss 50/50, rain water, 14 hours daylight, fan Always on