Okay, I think this probably just some sea monkey or something similar. But since the tank has a more interesting shape, that makes it worth mentioning.
Here we have Holoholo (in Hawaiian, that means wandering). Floating inside, little red shrimps in size of 1-2cm; great pets for anyone who doesn’t want to deal with maintance. All you need to do is pour some of that “Xwater” back in every now and then. If you want to know what Xwater is, feel free to read the long BS description.
And if you want your Holoholo warm and toasty, there is also the heater pad up for sale! Too bad it’s not USB friendly.
Check out Holoholo.