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I betcha salsalito is correct. The "W" thing sounds just like Notospermus tricuspidatus. Cheers, Don
The red fireworm/bristleworm probably isn't a problem, unless you poke him with your finger. The arminid nudibranchs are a problem, though. You...
I can't tell for positive from the pic, but it should be an Ark Clam, in the family Arcidae. They will withdraw and snug up into the rock when a...
I can only help on the molluscan questions. #5 is probably an oyster of one type or another, although from the single view, it could actually be a...
They are carnivores and don't really add anything to a cleanup crew, but they won't eat corals. They should mainly feed on small worms and vermetid...
It's an Ark Clam. They sometimes attach, but can crawl, and will relocate if necessary. There are several similar species, and you'd have to remove...
It's an arminid nudibranch. You can search for "arminid" on this forum, Reef Central, and probably some of the others and you'll find pics that look...
That's a pretty bizarre story, and sorry you had to go through all that. Any supplier should know by now that the dorid nudibranchs are sponge...
OK, considering that there aren't too many marine shells shaped like that, and the fact that they are apparently edible, and grow to be larger than a...
Probably going to have to have some apertural views to ID those, since they are so encrusted. The shape is typical of several fresh and brackish...
That looks to be an arminid nudibranch. They look like almost like dorids, but lack the exposed gill on the dorsum (and they look kinda like they...
Yep, it's a nudibranch but, it's not toxic enough to nuke a tank. Again, only the phyllidiids are likely to nuke a tank, and they don't ever have...
LOL I'm a snail guy, so I can't tell you much about the black blob...may be a sponge. The snail is a good guy, though. It's an algae-eating...
If you got two as hitchhikers, they are probably Dolabrifera dolabrifera. The Sea Slug Forum - Dolabrifera dolabrifera The above link says they...
Good, lol. If it eats algae for sure, that narrows the possibilities considerably. About the only similarly-shaped snails that are algae eaters are...
Sorry to be the co-bearer of bad news, but as Zach said...It doesn't eat algae. It can't eat algae, and won't eat algae. It also won't eat other...
This is a tough one, and you'd probably have to remove it and take some pics in a dish of water to get it positively identified. You would need an...
Hi Yuri, I think that actually IS a shell on it's back, just a transparent one, and you are looking at the parts of the animal through the shell....
I suspect they won't wipe out your sandbed fauna. They are mainly attracted to carrion, but they'll kill and eat other snails in your tank. I kept...
The encrustations probably won't hurt it and chances are are it won't be very spectacular-looking after you clean it. It's an oyster of one type or...
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