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Both are slipper snails? They have very different shells.Those are called slipper snails. Looks like an oyster but actually a gastropod. Crepidula fornicata is the species.
Unless you see one sticking out a long mouth, then yeah, they're both slipper snails/slipper limpets - in this case at least that top one is not Crepidula fornicata, though (the shell spirals the wrong way); you may have two different species, but I can't tell from the second pic. Regardless, they're harmless, and as you've gathered, they're filter feeders (feeding on phyto and tiny particles in the water column). Not a cause for concern at all.Both are slipper snails? They have very different shells.
What i could find says they are filter feeders? Any concerns in a mixed reef?
Thanks!
Haha, it's possible, just extremely unlikely.I wonder?
Yeah, it's not like a traditional snail shell/ram's horn spiral, but slipper snail shells typically curve up a bit on one side toward the pinnacle on the shell - Crepidula fornicata's curves slightly left (counter-clockwise).I don't think any of them have a counter-clockwise spiral to them. The slipper snails don't seem to have any spiral at all in fact, more like a limpet's shell.
If you do see a long proboscis, that'd indicate hoof snail - also harmless, but feeds either on its host waste, or on food brought into range by the host's movement.So far haven't seen any kind of proboscis but I'll keep an eye on 'em.