Need ID on this please.

Breakthecycle2 · Sep 5, 2014

I don't know what it is. It's this long white stringy things all over my liverock. It's the best picture I could get for now.

dub3 · Sep 5, 2014

I have them in my tank also. As ugly as they are IMO, I don't think they actually cause any harm. I believe they are just collecting food. Thy wrap around various coral in my tank and none of them ever close up.

NanaReefer · Sep 5, 2014

Sponge. Removed easily via siphon during WC.

Breakthecycle2 · Sep 6, 2014

NanaReefer said:
Sponge. Removed easily via siphon during WC.

Should I remove them or can i just leave them?

NanaReefer · Sep 9, 2014

Either or doesn't really matter. If you don't like the looks then remove them. Otherwise they are harmless filter feeders, most of which don't last long in our tanks.