growth?

[Gilbertg78228]

i have a growth in my tank i have noticed. its looks like cleto but white it grows in the dark areas under rocks. should i be worried? its very brittle

[dmweise]

It is most likely just a sponge. I get it from time to time as well. Increasing the flow and getting a critter that eats sponge takes care of it.

It isn't harmful, just ugly.

[JoshOdphi]

i like my lime green and purple sponge

[Ping]

Sponges are some of the best natural filters in our systems. Most do prefer low light and are also part of the filtration inside live rock.

[JoshOdphi]

good thing mine are spreading....

[Big_Pun]

I have a big yellow one I call it sponge bob, same exact color

[JoshOdphi]

spongebob...nice......

[uriah]

Sponge is good, but some of mine started to get out of hand, so had to trim.