Is it safe to use nitra-zorb?

[kyarnkid]

My nitrates are down to 20 and water changes have not seemed to budge that mark. Is it safe to use nitra-zorb to rid my problem?

 

[puff(er) daddy]

It's safe to use it if you just follow the instructions. You should find the source of the nitrate problem. B/c you'll have to keep using the sponge.

 

[heavenly damsel]

You could use some caulerpa if you want a natural cure to your nitrate problem.