Small moving black dots

[Sophiel]

Hello,

Does anyone know what these are?
They are small and moving around

 

[FranciscoB]

They are probably tiny snails. Better pictures (better focus, steady hand) would be needed to confirm and tell you what kind (family and genus). There is quite a diversity that may colonize a tank. From the look of your photo, it appears that they are small and flat/circular, which narrows them to a few types, excluding others. Better photos with your phone camera are needed.

 

[Sophiel]

 

[Sophiel]

Here’s a better phot

 

[FranciscoB]

Yes, better but still somewhat out of focus. they appear to be snails of the genus Gyraulus or related (family Planorbidae, same as larger Ramshorns). They are harmless but can become a nuisance when very abundant. What kind of fish do you keep?

 

[CaptainBarnicles]

Freshwater limpets?

 

[Sophiel]

I keep harlequins, cherry shrimp and wood shrimp. Nerite snails