Probably a hazard. You can have air pumps sitting on a thin bit of sponge but a pillow could cause it to get too hot and possibly catch fire.
Just turn it off for tonight and set up the HOB filter instead. Put a round sponge over the intake of the HOB so it doesn't suck the shrimp up.
Just turn it off for tonight and set up the HOB filter instead. Put a round sponge over the intake of the HOB so it doesn't suck the shrimp up.