Leather mushroom problem

[Justincasha]

I had this leather toodstool for about 6 mounths but this week I've noticed this hole which I think it's getting bigger.. Is this bad??

 

[taylor t]

I don't pay attention to my toadstool much, but when I notice it start melting in spots like that, I add more flow, and they go away. Seems to me, for mine, it is from lack of flow. Toadstools are tough, chop them up, they keep growing. Hard to kill.

This forum may help you better.
http://www.reefcentral.com/forums/forumdisplay.php?f=424