What Is This

[jaylam]

On my LR, the 2 white things:

 

[-Nemo-]

Just look like sponges. Harmless filter feeders.

 

[jaylam]

Just look like sponges. Harmless filter feeders.

Thanks, so they can stay without halming anything.

 

[seffieuk]

Thanks, so they can stay without halming anything.

Yes, they are a good indicator of water quality

Seffie x