I have found an answer to my question! Because the Monopterus-Cuchia has scales that are not visible, it does not classify as having scales in halacha.
For sources, I quote from the oukosher.org site the following: " Both the Aruch HaShulchan and the Tiferes Yisroel mention that the kaskeses must be perceivable by the naked eye from a normal distance in order to be halachicly significant."
I am not sure the exact place they got this from but I also think that it won't be too hard to contact them (or find it ourselves) and get the precise source. But I think for now we can rely on this.
Then for the proof that the Monopterus-Cuchia does not have halachic scales, I refer to fisheriesjournal.org: "Monopterus-Cuchia is a freshwater fish species commonly known as mud eel, swamp eel, cuche or cuchia. It is looks like snake and smooth slimy scale less skin"
For the specific links, see here: (1: https://oukosher.org/blog/consumer-kosher/an-analysis-of-kaskeses-past-and-present-2/) (2:https://www.fisheriesjournal.com/archives/2019/vol7issue6/PartA/7-5-73-913.pdf )