I do have some experiences keeping crypts emersed with varied level of success. To grow crypts emerse, I believe there need to be a certain level of shade firstly. When I grew C. balansae emerse, those that were shaded under tall stands of Cryperus helferi did better than those in full sun which wilted.
As mentioned, humidity is key as well. Personally, I do not believe that you can grow Crypts emersed with partial water (in Choy's case for mosquito control) because of Crypt rot. Moreover, if one notice the crypts in nature, those that are found in water, are almost usually fully submerged when found. Whereas those that are found emerse, are usually only wet at the base where they are rooted and the leaves are almost entirely our of water.
I have seen some hobbyist covering their tanks with cellophane paper to maintain humidity, which might work. But the best way is to get one of those mist making devices. (Personally, I think the humidity factor is less important if the plant gets good shade). A rich substrate most definitely helps as well.
Lastly, I tried planting just the tuber and the entire plant in an experiment. I find that just planting the tuber or rhizome has better success rates since most of the leaves rot away anyway, and expose the plant to rot.
Hope this helps...
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