Odd critter ID

[Geecee]

My tank is about 8 weeks old and I have noticed two half pipes against the glass. The tubes are sand grains cemented together and about 25mm or 1 inch long. You can see something moving inside that is approx 1cm long with beating legs/appendages. At first glance they look a bit like immature shrimp but very hard to see and imposible to photograph.

Any ideas of what they could be?

Geecee

[Gillybaby]

Sound like pods of some description or other. One of my favourite Reefkeeping articles is on pods, have a read through it and see if you can spot them:

You Can't Tell Your "Pods" Without a Program (http://www.reefkeeping.com/issues/2004-08/rs/index.php)

[Tetley]

Yep,

Agree with Gilly, pod of some sort. :)

ATB

[Geecee]

Thanks for ideas - there is a little green algae on the glass inside the half tube so it is difficult to get a clear view - I would have to destroy the tube to see but hey, they are cool for the minute - will keep an eye on them though.

Geecee