Marble?

[Timrpn]

I am wondering If i can put marble in my tank, it is 100% marble from a Mortar and pestle. I want to use the pestle to weigh down my nori at the bottom of the tank, one of my fish stopped eating from my clip and grazer, so I am trying maybe to put it down at bottom of the tank to see if it was graze on it. I don’t have a glass block and cant think of anything that is heavy, reef safe, and will sink. It has never been used before so has not been exposed to household chemicals.

 

[Timrpn]

I am wondering If i can put marble in my tank, it is 100% marble from a Mortar and pestle. I want to use the pestle to weigh down my nori at the bottom of the tank, one of my fish stopped eating from my clip and grazer, so I am trying maybe to put it down at bottom of the tank to see if it was graze on it. I don’t have a glass block and cant think of anything that is heavy, reef safe, and will sink. It has never been used before so has not been exposed to household chemicals.

 

[Timrpn]

Here it is

 

[malacoda]

Ought to be fine. A lot guys use chunks of marble tile in lieu of frag plugs.