what are these???

[gmr48]

hello, im new to sw just added water live sand and live rock to tank, letting it cycle, i have one rock with some things? on them any clue to what they are, first pic there are about 3 of these, there white round and look like a golf ball, the 3rd id round with little spikes...good bad? what should i do

 

[bigarn]

the round golf ball shaped thing in the first pic is a sponge ... not to worry they're harmless filter feeders.
i'm not sure what i'm looking at in the second pic.

 

[mushroomss]

i have no idea either arn.

im waiting for a reply lol

 

[coraljunky]

Second pic looks like an old duster colony.

 

[mushroomss]

+1 to duster colony