don't remove leaves ... unless drastic leaf-loss is happening, things are 'probably' OK ... bottom leaves yellowing, and dropping off, is perfectly normal ... it's just part of the aging process, as the plant draws from it's fan leaves ... (side-note: your RO water doesn't contain necessary micro-nutrients, like calcium, iron, magnesium, etc., etc. ... look for other sources, or start adding Cal-Mag+, Earth Juice Micro-Grow, etc..) ... good luck :smokin: