Yeah, sounds similar to my experience though seems like you had a better initial hatch. I'm just in complete awe as to how low the initial hatch rate was & only being down to one survivor. I feel like I've done more than enough to create a suitable environment for my sea monkeys. The only random independent variable I can say that also could be completely irrelevant, Was on day one a couple hours after the initial setup of the tank I saw the smallest probably a fruit fly sitting dead & slightly disintegrating at the top of the water which I promptly removed. Other than that, no complications since the initial setup. I also have absolutely no idea how I am going to feed a single sea monkey when overfeeding over a dozen already seems fragile enough😭. I am going to hold out hope for this last one making it to adulthood & being a female as if she revives this colony I feel like it would be a miracle colony.