PDA

View Full Version : Crushed oyster shell and coral calcium


Elrodg
02/06/2013, 09:42 PM
Ok so I have about a 50 lb bag of crushed oyster shells and powdered coral calcium.

Would it be beneficial to add this to my sand bed or fuge?

blanden.adam
02/06/2013, 10:10 PM
In a word, no. Oyster shells and powdered coral calcium are primarily aragonite, which is insoluble at reef pH and is roughly the same composition as your sand anyway. So, at best it will do nothing, and at worst you will have cloudy water form the powdered coral calcium kicking up in the flow :)

Elrodg
02/06/2013, 10:17 PM
Maybe I should've elaborated a bit.
I just built my sump and was thinking about using it as a base for my dsb

blanden.adam
02/06/2013, 10:25 PM
If I wanted a DSB, I'd just use a small grained sand. Idk how well those products would work, but I can't say they wouldn't.

Elrodg
02/06/2013, 10:26 PM
Well basically I was thinking as just a base. Maybe an inch deep over my 5-6" dsb

Elrodg
02/06/2013, 10:31 PM
Most of my experience was in freshwater. Plants and such. And we used a dirt base capped with sand and gravel to create a cryptic zone of sorts.
Am I just still thinking along the freshwater lines? Or is the principle the same for salty

bertoni
02/06/2013, 11:24 PM
The comparatively large grain of some products like that makes them capable of collecting a lot of organic debris. I ended up throwing away my crushed coral for this reason. In addition, I wouldn't expect a DSB to function well with such a layer on top.

Elrodg
02/07/2013, 01:09 AM
No on bottom. As a base.

bertoni
02/07/2013, 02:04 AM
As a base, it'll work it's way to the top over time. Even at the bottom, it won't work well as a sandbed due to the large grain size.