Calcium carbonate from egg shells

[Greg Clayton]

I've used crushed/powdered egg shells for nutrients for my houseplants and garden plants for years. I know that the shells are 94-97% calcium carbonate. My question is Is it safe to use in a reef tank to feed corals? I've read some places that it can be used for feeding corals and others that say it's only for clearing the water.

 

[Fish Styx]

Randy addressed this topic a few years back:

Post in thread 'Can i use egg shells to bring my calcium up' https://www.reef2reef.com/threads/can-i-use-egg-shells-to-bring-my-calcium-up.714981/post-7402571

 

[Fish Fan]

It came up more recently too, and this is how Randy addressed it:
https://www.reef2reef.com/threads/an-observation.1151949/post-14303255

 

[Greg Clayton]

It came up more recently too, and this is how Randy addressed it:
https://www.reef2reef.com/threads/an-observation.1151949/post-14303255

Thanks. I knew this would be the best place to for real answers. I appreciate it.

 

[Greg Clayton]

Randy addressed this topic a few years back:

Post in thread 'Can i use egg shells to bring my calcium up' https://www.reef2reef.com/threads/can-i-use-egg-shells-to-bring-my-calcium-up.714981/post-7402571

Thanks. I knew this would be the best place to for real answers. I appreciate it.