What are these

[mitchell01]

they are quite small but have no idea what they are these things have small antennas coming outta their head they only come out at like 9-10 ish when bluelights are on

 

[AllSignsPointToFish]

They look like the small white snails I have in my tank. Harmless as far as I can tell.

 

[pdt7361]

Maybe a whole bunch of little stomatellas

 

[TheEngineer]

Most likely limpets. Look like these?

http://www.lionfishlair.com/hitchhikers-guide/snail-limpet/

 

[AllSignsPointToFish]

I've always assumed they were baby Nerite snails.

 

[mitchell01]

Yes @TheEngineer but with smooth shells

 

[TheEngineer]

They usually have a really tiny hole at the top of their shell. They are oval shaped.

 

[mitchell01]

Are limpets harmless

 

[AllSignsPointToFish]

Are limpets harmless

They're usually okay, but they will scour the bases of golf ball corals that come on aquacultured live rock. Consequently, all of mine were banished to the sump where they do a good job keeping sump walls and baffles clean.

 

[mitchell01]

And they are quite small like maybe 8mm not quite a centimetre @TheEngineer

 

[mitchell01]

They're usually okay, but they will scour the bases of golf ball corals that come on aquacultured live rock. Consequently, all of mine were banished to the sump where they do a good job keeping sump walls and baffles clean.

I have a lot just net them

 

[AllSignsPointToFish]

I have a lot just net them

I'm surprised you can net them. Limpets have quite a strong foothold, and the only way I know to get them off is to grab them with your fingers and twist.

 

[mitchell01]

They are super small like 8 mm

 

[AllSignsPointToFish]

They are super small like 8 mm

The ones I was thinking about are closer to 3 mm than 8 mm. Are they oval or round? I can't tell from your picture, but I'm assuming you were talking about the white specs on the glass.

 

[mitchell01]

The ones I was thinking about are closer to 3 mm than 8 mm. Are they oval or round? I can't tell from your picture, but I'm assuming you were talking about the white specs on the glass.

Yes the ones on the glass and yes probably more like 3mm but they always hide in the morning

 

[mitchell01]

And they are round

 

[AllSignsPointToFish]

Limpets will definitely have an oval shape, so they are most likely not limpets. Also, limpet shells are conical and have a hole in the point of the cone.

 

[TheEngineer]

Limpets will definitely have an oval shape, so they are most likely not limpets. Also, limpet shells are conical and have a hole in the point of the cone.

+1

Can you get a better pic?

 

[AllSignsPointToFish]

Here is a picture of a fleshy limpet. You can clearly see the shape of the shell and the hole at the conical apex. Not all limpets have a fleshy outer membrane, some just have shells.

 

[jeflen651]

Do they show on the glass when the lights have been off, then after the lights have been on for about an hour they disappear. They could be asterina that is harmless but can multiply. I have them and whenever I am doing a water change I will pick them of the glass and toss them.