I don't think anything is eating your rock. Probably a few spots on it or the whole rock is friable and just decompose naturaly. If you toutched it and it fell apart, it is probably that it was on it's way to dissolve.
Why is it dissolving? not sure. It could be too porous or maybe just calcium dissolving?
I never seen rock eaters, does that even exist? I think you just have bad rock that are dissolving.
If you dip your rocks it will kill the good live on it.
Here some possible explanation:
http://www.wetwebmedia.com/ca/volume.../live_rock.htm
Quote:
Originally Posted by KeMo
Ok so first off the tank is a 29 gal running for 5-6 months. Rest of tank info at signature. So all the LR i got was from the same store. Bought same time.
After about 2-3 weeks or getting the tank running I noticed to holes in the side of my biggest and nicest piece . The holes looked like some one took a drill and made two holes side by side about the size of a dime. Their is about 2 mm in between the two holes. So I put my hand in to investigate and right when I touched the part in between it fell to dust. The hole area around it just started to fall apart and go deeper into the rock. It went in farther then i wanted to stick my finger  . So I left it and thought maybe it was the sand that did not settle when i switched from crushed coral to LS.
Fastforward to know. I have since noticed more holes in my rock and it appears that it is moving or their are more then one. 4 rocks over more holes the same size . Also during normal weekly water change and tank up keep I picked up the rock that originally had the problem and when I did sand just started to poor out of the rock from the bottom out of a hole. I know its not the sand from the bed as this sand is like dust and always has a much darker tinge.
First off I know its not a mantis as the tank has been up 5-6 months and never once have herd any clicking sound. Its not a rock urchin as I since have added one and he just skims the top of the rock. Plus the holes are way to deep and it was their before him. I am getting two the point were I am dosing and want to add my corals but I am scared as If this thing eats rock like that it will prob make short work of them.
I have no idea what it is but i know its not that big as I always look into the tank when lights are out and never see anything out of the normal.
I cant afford to go out and just buy 40 more lbs of LR. Plus I dont trust that place for good LR any more (BigAls Young&Steels) . Their is live stock know in the tank and I dont want to recycle with new LR as their is no were to get rock that is 100& cycled that I know of other then waiting on a used tank. Also My rock has alot of iso,cope,and amphipods . I kinda dont wanna get rid of them but what do I do? any ideas or help at what this could be or what to do would be a great great help.I would re cure the rock piece by piece but how do I know its just not moving from them when I do that.
Thanks again Everyone.
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