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Well, it's actually a marginellid, but they can look almost exactly like cowries. They can be predatory on other tiny animals in your tank,...
There are quite a few with solid-colored shells. None of them are harmful unless they manage to harpoon you. Most cone snails are worm eaters, and...
It's not a nudibranch. If it's a mollusc, it's probably one that is covered in sponge growth. I've seen a couple of chitons that were encrusted so...
...but not true limpets, they are fissurellids ("Keyhole Limpets").
Thanks for the info.
Most if not all of the animals are chitons for sure, but it looks like you have a couple of different genera reproducing in your tank. The little...
Yep, it's a Tegula species, and will be a good algae grazer. Cheers, Don
If LeslieH shows up, she can possibly identify it to the species level, and will certainly be able to confirm the family. You might try messaging...
Nope. They won't hurt anything. The toxic ones aren't very closely related to the ones you have. Cheers, Don
The pics on the Seaslugforum of the little red nudi's are close-ups that show the internal organs. All the other pics I've seen of Vayssierea show...
If you have flatworms, they will be almost as wide as they are long. If they are four or five times as long as they are wide, they might actually be...
They've already narrowed it down for you, and it's either a Spiny Oyster (Spondylus) or a Jewel Box (Chama species). Some of them can look very...
For all the beetle/cockroach speculation, I think I'm going to predict it's a Stomatella (they always look like bugs or cockroaches to me, with the...
Yes, it's an aeolid nudibranch, and as the others noted, one that you'll most likely want to remove. Cheers, Don
That's an intriguing animal. I've seen lots of blue flatworms and lots of blue nudibranchs, but none with the "horns." If you can, take it out of...
Don't spend too much time regretting getting it out of your tank :) Most of the nudi's that turn up in tanks that resemble Berghia end up eating...
Yeah, you'll want to remove it. Most of the aeolid nudi's that aquarists find are eating one of their soft corals or another. If you found one,...
I'm a snail nerd. But I enjoyed keeping mainly different mollusc tanks for several years, and learned quite a bit keeping them and reading about...
It could be a Stomatella, which is probably most likely, or it could actually be a snail that has had the ligament detach in the spire of the shell,...
OK, here goes...it is one of the species being lumped under the name Hypselodoris bullocki. It eats only one or a possibly a couple of species of...
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