Bifferwine
I am a girl
The airstone will quickly get clogged with salt anyways... If it looks cool, you can leave it in, but it won't last long.
Tanks looking good BTW.
Getting a refactometer is a good idea. The hydrometer that I had was wayyyyy off. When do you plan on adding more rock? How many total pounds are yoou going to have? Tank looks good.
Sound like a brittleworm. See if you can find it using the link below.
Melev's Reef - Visual Identification