What the heck is this?

[AC-WEB]

Saw this growing next to my RBTA. I'm pretty sure they aren't clown fish eggs, and it has gotten bigger. Anything to worry about?

AC-WEB

 

[RBU1]

Nope its a sponge....Good sign...

 

[AC-WEB]

Nope its a sponge....Good sign...

Thanks! I though it was a sponge, but I have sponges on another rock, but it shoots up in narrow tubes.

Why is it a good sign? Just wondering

 

[RBU1]

Sign of a healthy tank...

 

[AC-WEB]

Sign of a healthy tank...

Thats good to know! Especially because I go a little against the grain when it comes to water. I actually don't have an RO filter. I use a PUR 3 stage filtered water to top off my tank at 1 gallon a day. I do a 5 gallon water change with premixed saltwater from my lfs at least monthly. I do have a gfo phosphate reactor that I hope takes care of the phosphate they may come through my filtered tap water.