Hi just want to know what is this thing in here because its growing besides some coral its round and hard when i try to break it it has some water inside
Sounds like bubble algae to me.
Some say they have had luck with a foxface fish eating it. Other claim emerald crabs will too. But one thing is for sure u will need to get your phosphates down in your system.
If you can pull the rock out that has the algae growing on it and turn the bubbles like a light bulb to dislodge it from the rock, thats your best bet for manual removal.