Gastropod?

[webuhgnar]

Hi, new here and hoping for an ID. Any info is greatly appreciated! This guy recently got much larger in size, and now there’s suddenly a multitude of critters on my glass, so I was thinking they may be the same organism. However, the tiny glass-dwellers move around quite a bit, while the organism on the hermit has never moved. Im now thinking it’s flatworms on the glass? I had no idea how complex keeping a tank would be and find myself trying to solve mysteries/problems on the daily. Any info is greatly appreciated! For the record, 20 gallon tank with inverts only

 

[KrisReef]

I think the shell is a Crepidula, and the 2nd picture does appear to have flatworms on the glass.
The others things, ?

 

[ISpeakForTheSeas]

For the first, probably a hoof snail (though Crepidula is also a good guess); for the things on the glass, you have both flatworms and hydroids.

Hoof snail or similar (such as a slipper limpet) - harmless, and not a parasite:

hoof snail (taxonomic family Hipponicidae). Some of the species you’d find on things living in shells feed on the waste of their host, others basically feed on whatever is brought into their range by their host. Harmless, sessile, and a neat find.

I know some hoof snails use a long proboscis - the siphon mouth - for feeding this way, I’m not sure if some slipper limpets/snails do too or not

 

[webuhgnar]

Ah, thanks! I thought it was something like that but then started doubting once all the worms appeared.

Hydroids=Medusa buds from hydrozoans? I’m guessing no bueno.. I had seen a couple small polyps when I first put a live rock in but hadn’t seen any again..

I haven’t introduced anything new in a while, but the last couple days the water turned green and the flatworms and hydroids appeared. They don’t seem to be the red flatworms, but I imagine it’s problematic no matter the species?

Thanks everyone!

 

[ISpeakForTheSeas]

Ah, thanks! I thought it was something like that but then started doubting once all the worms appeared.

Hydroids=Medusa buds from hydrozoans? I’m guessing no bueno.. I had seen a couple small polyps when I first put a live rock in but hadn’t seen any again..

I haven’t introduced anything new in a while, but the last couple days the water turned green and the flatworms and hydroids appeared. They don’t seem to be the red flatworms, but I imagine it’s problematic no matter the species?

Thanks everyone!

Hydroids is just a term referring to Hydrozoans, but in this case, yeah, they're at the medusa life stage. They're generally considered negative; depending on the species and the availability of food in your tank, they may or may not go away on their own (my understanding is that most species die off after a while in our tanks if they're in the medusa stage - if they're in the polyp stage, you generally need to get rid of them).

Yeah, it looks like you have ghost flatworms; they're still not good, but they're not nearly as bad the red ones (ghost flatworms are more neutral).

 

[webuhgnar]

Hydroids is just a term referring to Hydrozoans, but in this case, yeah, they're at the medusa life stage. They're generally considered negative; depending on the species and the availability of food in your tank, they may or may not go away on their own (my understanding is that most species die off after a while in our tanks if they're in the medusa stage - if they're in the polyp stage, you generally need to get rid of them).

Yeah, it looks like you have ghost flatworms; they're still not good, but they're not nearly as bad the red ones (ghost flatworms are more neutral).

I’m only seeing them on the front side of the glass. I’m thinking I’m just going to wipe them off.. does that seem sound? Hydroids are already nowhere to be found. I lost power for about 12 hours last week. I was not prepared and had to manually aerate.. after that the tank turned green and the flatworms and hydroids appeared. It’s almost completely clear now and there’s less odd activity on the glass..

Appreciate your responses !

 

[ISpeakForTheSeas]

I’m only seeing them on the front side of the glass. I’m thinking I’m just going to wipe them off.. does that seem sound?

With ghost flatworms, that may work (if they were red I’d suggest suctioning them out, as they release toxins when they die) - I don’t know of anyone who has tried it though.

If it doesn’t work, then wrasses reportedly love to eat them, and suctioning them out should work too.