More Sand Ignorance

Can I use sand from a previous freshwater setup in a new saltwater tank if I clean it? I plan on mixing it with live sand but I really like the appearance of this jet black sand and think it would look incredible in a clownfish setup. Plus I already have ample amounts of it. If this is unsafe please say so I’m just trying to determine if it’s safe to use or not.

I would also like to add that though this sand has been in a cycled freshwater tank, it has never been with fish. I cycled the tank wanting to do a betta sorority and then upon my research decided that a sorority wasn’t in the best interest of the fish so I’m scrapping the idea and trying a clownfish setup instead.

 

Clean it & use it. The cycling process will start anew.

 

No, part of the problem is that the mix of substrate for freshwater is more likely to get blown around by a powerhead or is too coarse to be of any use to marine life. Something like Argonite or a mixed substrate (ie Live Sand) is a much better choice.

 

There is this black sand. I haven’t seen it around but it’s marine safe. Not sure on the size as mentioned above power heads could cause the sand to damage pumps.

 

There is this black sand. I haven’t seen it around but it’s marine safe. Not sure on the size as mentioned above power heads could cause the sand to damage pumps.

How many lbs would I need for a 29 gal tank?

 

How many lbs would I need for a 29 gal tank?

About 1.5 pounds per gallon.