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Fungal and bacterial infections come in all forms. Moving air prevents too wet ,too long. You might have your greenhouse too well sealed off from fresh air. Try and open the the vents on nice days and mix as much fresh air to dry out the excess moisture. And more fans strategically placed would help. The best greenhouses or conservatorys make air circulation a top priority with good reason. You dont want a giant terrarium.

So much easier to just water the plant when it needs it an forget about any wicks or reservoirs. It may be standard advice to let the soil dry to some depth, but Rhapis palms have relatively poor drought tolerance. They reluctantly show under watering damage, and when they DO..., it is often too late. I would grow it in a more conventional container. Then, when you do water, drench the plant (no need to measure it in ounces), then wait for the the soil surface to begin to dry somewhat before dewatering. Also, what is the light exposure..., they are not the biggest sun lovers and direct sun can burn them if not acclimated.

Those are individual plants. Palm growers plant several seedlings in a pot to get a clump like that. I can only tell you how I've seen it done at nurseries I've worked at. The pot will be pretty rootbound. If there is a mass of roots around the sides and you can't "tease" the plants apart, just slice about 1/4 inch off the sides and about 1/2 inch off the bottom to free up the root ball. Then bang the root ball on the ground hard until the root ball loosens up. Then try to tease the plants apart. You can use a turning fork or pitchfork to work in between the plants and separate them. You're going to damage some roots, but that's o.k. Once you get them separated (this may take awhile, so be patient), cut off all but the top three fronds, in other words, "rooster tail" each plant. Prune the bottom half off of the largest bottom frond. Put them into individual pots or where you want them to be, and water well. If you just want to make two separate clumps, slice the ball in two, tease the bottom roots out and plant each clump individually.