What is this???

[jason]

Can anybody help identify what this might be? It's hard like a crustacean and is on my rock and glass.

[Fracture]

I think it's limpets

[Sherita]

snail eggs. You must have nerite or astrea snails in your tank.

[jason]

Yes, I have both kinds of snails. Thank you!

[FireWater]

Agree with the snail eggs. Someone's been busy.

[Reef Valley]

Looks like Nerite snail eggs to me, I had tons of them at home but they never made it to adults.