Limestone "screenings"

[DocB]

I've got two questions as I empty my current 29-gallon reef tank (5-years old) and put the contents into a new 75-gallon tank....

1st: The 29-gallon tank has crushed coral (~3-5 mm) as a substrate but I want to put a DSB into the 75-gallon. What should I do with the crushed coral? I feel bad simply discarding it as it has a fair abundance of amphipods, copepods, worms, and little seastars/brittlestars.

2nd: My local Home Depot does not carry "SouthDown" sand but has something labelled as "limestone screenings" that looks like sand to me. It seems to have a large range in grain size but basically looks like "sand". Does anyone have any experience with this stuff as a substrate?

Thanks for any help!
Cheers

 

[Anonymous]

You could use the crushed coral in some type of trickle filter. And that way salvage the pods and stuff.

No familiar with limestone screenings.

I just use play sand but do use a calcium carbonate source (oyster shells) in my trickle filter in the sump.

edited "pods" above. LOL

 

[Anonymous]

Welcome to RDO, DocB!

Does the limestone "screening" totally disappears if you add mild acid (vinegar, for example) to it?

 

[DocB]

beaslbob & Reef Box Etc - thanks for the replies.

Not sure about the mild acid but will check. If it does disappear, then what?
Cheers,
DocB