Hitchickers In My Tank?

[FrankP]

My Marine tank is now anout 2 months old and maturing quite nicley. the watre parameters are good and stable. My clean up crew is slowly getting rid of the algae.

I have now noticed hundreds of small white creatures of varying size form thta of a pin head to 5mm. They seem to live on the glass of the tank. Nay idea what they are and what i should do about them?

Secondly I have just noticed a bigger 1-2 cm long. It looks like land snail with no shell covered in algae.

Thirdly I have seen tiny tadpole type creature swimming in and out of the holes in the live rock.

I have no idea what any of this stuff is or if it is benifical.

Any advice gratefully recieved.

Frank

 

[Aquascaper]

The small white creatures are Copepods and are very beneficial to the tank ecosystem and a good sign that the tank is maturing well.
As for the rest of the creatures, the snail with no shell sounds like it could be a Chiton, again a good tankmate, but the tadpole thing I have no idea.
If you could post some pictures that would help a lot.