Maxima Clam

The Solar Radiation Mandate (Light Starvation):

The Photon Hunger. Maxima Clams naturally live in shallow, crystal-clear ocean reefs getting blasted by the tropical sun. THE LETHAL ERROR: You CANNOT keep this clam under weak, cheap LED lights or deep down in the shadows of the tank. If the lighting is not utterly blinding and perfectly spectrum-tuned, the clam will slowly starve to death. The symbiotic algae will die, the clam's neon blue colors will fade to a sickly white (Bleaching), and the mantle will permanently collapse into the shell.

The Calcium Drain and Water Chemistry:

The Liquid Rock Vampire. In order to build its incredibly thick, massive, heavy shell, the Maxima Clam constantly sucks massive amounts of Calcium, Alkalinity (KH), and Magnesium right out of the water. If you do not have an expensive Calcium Reactor or are not aggressively dosing 2-part chemical supplements every single day, this giant clam will drain the tank's calcium to zero, crippling its own growth and crashing the entire coral reef ecosystem around it.

The Achilles Heel (The Byssal Gland and Pests):

The Ripping Fatality. At the bottom of the clam is a small hole where it extends sticky threads (the Byssal Gland) to glue itself permanently to the rocks. NEVER grab a clam and forcefully rip it off a rock. You will tear the delicate gland out of its body, and it will bleed to death. Additionally, you must constantly inspect the clam at night with a flashlight for tiny, parasitic white snails (Pyramidellidae snails) that act like vampires, drilling into the clam and sucking its bodily fluids until it dies.