Re "The Desktop Tank is just a BiOrb with a very high markup":
A regular BiOrb is not suitable for jellyfish because bubbles will get trapped underneath the jellyfish, which can cause embolisms. We modify the BiOrb in order to make it habitable by jellyfish. Also, the BiOrb you buy from Petco for $127 does not include a heater, thermometer, salt, cycle, dechlorinator, glass pebbles, dropper or a hydrometer. This brings our price to $249. If you search for prices for all of these items separately, I think you'll find that our price tag on the Desktop Tank is reasonable.