Best way to remove phos from new rock

[LadyTang2]

After ordering new rock whats the best way to reduce the phos in it in steps, randy what would you do? Scrub then soak, vinegar, run gfo in the rodi tub water? What would the order of steps be? Thanks!!

 

[chipmunkofdoom2]

Do you know the rock has high PO4? Some dry rock doesn't.

I would put it in saltwater for a week, then measure phosphates with a hobby-grade test kit. If the results are very high, you could use something like GFO or lanthanum-based products to drop it rapidly. If the results are just a little high, you might be able to just do one or two 100% water changes a week apart to get them down.

Previously when I got some rock with very high PO4, I put it in a 5g bucket and added a very healthy dose of lanthanum chloride. The next day I rinsed the rock, rinsed the bucket, and repeated. Two doses seemed to do the trick.

 

[LadyTang2]

Can lanthanum bind to rock in any of its forms?

I know its dangerous for fish, is it possible to stick to rock then later come off and hurt fish?