Lil creature growing

[Romanscu]

Hi everyone, so i was looking at my tank today and noticed something growing. My tank is about 2 years old and i am learning still. First pic u can see what appears lome a cocoon. And the second pic something swimming near by. Could anybody tell me what this is.
Thank you
Roman

 

[Crabs McJones]

First picture is a sponge, and the second is an amphipod.
Both are great for your tank

 

[Proteus Meep]

First one is possibly just a little sponge growing the second an Amphipod

 

[Hendrix]

Hi everyone, so i was looking at my tank today and noticed something growing. My tank is about 2 years old and i am learning still. First pic u can see what appears lome a cocoon. And the second pic something swimming near by. Could anybody tell me what this is.
Thank you
Roman

1st - Harmless sponge
2nd - Arthropod - Harmless

 

[Romanscu]

Thank you. I got this video from reservoir.
Wanted to make sure they were safe.

 

[Proteus Meep]

Here is a other little clip i love of a pair busily working together to make a home/nest

 

[BZOFIQ]

Here is a other little clip i love of a pair busily working together to make a home/nest

That's a fantastic video showing some cool behavior. Thanks for sharing!