what are these?!

[JASONinNM]

Got a matured tank from a friend and had these in a little basket in the tank... he forgot to take them out before he left.. he wanted them but left state lines so I suppose they are mine so id like to know exactly what they are? Coral skeletons? Rocks? Weird shapes and tinny little holes in most of them

 

[uscamaro]

Looks like LR rubble.

 

[JASONinNM]

What could these be used for? I was thinkin bout putting them in little cups that fit media in my sump?

 

[uscamaro]

It's a great biological filter. Make sure they are completely submerged in your sump in order for them to be most effective; think of them as a replacement for bio-balls.

 

[JASONinNM]

That's exactly what I was.. cool I'm catching on fast... it pays to do the home work!

 

[uscamaro]

It sure does! Keep it up and you'll have a very successful tank... not to mention you'll save a lot of money!

 

[Gti_Leo]

looks lie ka few pieces of corals in there as well

 

[JASONinNM]

That's what I thought... the mojority off them are shapped like mini corols. They all have tiny tiny holes them in all... what else could these be used for?