Any clue what these are? Pest's or not ?

[dmjr1201]

Pulled an old plug off and found these. Should I be worried? If so what route should I take?

 

[sureal00]

those are limpets they eat algae, detritus and diatoms

 

[evolved]

+1 on limpets

 

[dmjr1201]

those are limpets they eat algae, detritus and diatoms

The two on right look different? Thanks for the quick reply.

 

[dmjr1201]

+1 on limpets

Thanks !

 

[evolved]

The two on right look different?

Possibly chitons if so; the three look similar to me though.

 

[acidtablockshifty]

eats detritus, bag em up lol