And from James Fatherree
Genus Amplexidiscus:
"Lastly we get to the genus Amplexidiscus, which has only one member. These are called elephant ear mushrooms due to their large size, and they’re all Amplexidiscus fenestrafer. How big is large? While they may stop growing at a little under a foot across, some may keep on going until they’re more like a foot and a half in diameter. That’s a big mushroom.
Elephant ear mushrooms are typically brown to greenish in color and they have a broad but short base. They also have lots of tentacles on their discs, but these are again unique. Their tentacles are often relatively long for a mushroom and are very simple and thin, often ending in a point. They really look a lot more like a big flattened out sea anemone than anything else. Easy to tell apart from the others.
As you might guess, these can also thrive under a broad range of lighting, from low to high intensity, and will also prefer lower currents. Thus, they can also be placed practically anywhere the current isn't too strong. However, these can apparently produce a sort of toxic mucous which can affect corals it comes into contact with, so I suggest you keep them from even coming really close to other things. Again, keep in mind how big they get, as well.
These can also reproduce asexually in aquariums, but unlike the others they don't tend to form big clusters. Instead of splitting or spreading around pieces of themselves over and over, these tend to live a solitary life, or form only smaller groups. Typically, there will be less than a half-dozen in any given spot.
Lastly, these are big eaters, indeed, that can also eat fishes. So beware, as these can and will get hold of fishes you don't want eaten on occasion. You'll need to give them some meaty foods to keep them happy, which can include small fishes if you like. Really, because these are so big and are able to eat smaller fishes, they aren't very popular with most hobbyists for good reason."
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