Hoping that anyone could offer tips on Remusatia culture. I received 2 Pumilla and 1 Vivipara bulbs, soaked them overnight, and sat them on top of a super well draining aroid mix in clear 4" pots outside in the shade but with Houston heat and humidity. They all started out well but the Pumilla we're much faster than the Vivipara. One of the Pumilla's roots lifted the bulb clear out of the pot (1 leaf at this point). I repotted, burying the bulb this time so I'd didn't budge and within about a weeks time it rotted away to nothing. The second Pumilla had 2 leaves but one started fading. I started reading up on the plant more at this point and realized they may be from a cooler climate and the 100 degree daily temps may be too much for them. So I moved them inside the house a week ago and now the second Pumilla leaf is fading. The Vivipara hasn't pushed a leaf yet but it's working it's way up. I've watered on the same schedule as my other Aroids so about once a week alternating between fish emsion and MG. The rotted Pumilla really threw me off because everything I read said they liked really humousy soil and I have them in a super well draining mix. Any ideas as to what I'm doing wrong here?

Hi Keys, Its hard to tell where you are misstepping here but my thought would be your fertilization. If your plants are basically still just corms and a leaf weekly fertilization may be way too much. I don't think heat is the culprit. I have an almost identical climate to yours, we are right across the Gulf of Mexico from each other, (and I grew up around Houston so I have a base to compare to). The heat and humidity here are absolutely brutal from about mid-March through November. Our local botanical garden has Vivipara LONG established outdoors in a huge bed that thrive in the heat, frequent monsoonal rains, and are not killed by frost or freeze.
The super well draining aroid mix is spot on, because most people look at Remusatia and see 'elephant ear' when actually this plant is not terrestrial, its an epiphyte. A friend of mine has even grown them mounted on tree branches here. So they are accustomed to high heat, high humidity, poor soil (we have sand, drains like a collander) and high volumes of water. The only outlier is your aggressive fertilizer schedule. If they were established plants, I could easily see feeding on that schedule. But just starting from a corm it may be too much

Thanks Gina, maybe I got a little too fert happy. It looks like my second Pumilla is a goner too. The roots are all shot. The petiole is rotting off at the base but the bulb/corm/tuber/whatever is wrinkled up like it dessicated. There is still a little bit of moisture in the media, it definitely isn't bone dry. I'm really disappointed with these, they went downhill so fast. Do you think I should keep the Vivipara inside (72 degrees at about 50% humidity) so as not to stress it again by relocating it back to outside? This bulb was bigger than the others but I don't see any healthy roots through the clear pot. Hopefully he still has enough energy stored to rebound.

Yikes that did crater. Were the corms firm and hard and unwrinkled when you got them?