- Jan 2, 2020
- Reaction score
I believe that Ive got the same issue. Im having trouble growing even the simplist of corals and it seems like the rock eventually absorbs it somehow. Ive never been able to lower my phosphates after a certain point. I just need to do a little more research...
Look into lanthanum chloride. Very, very careful administration of lanthanum chloride can help pull phosphate out of your rock. If you're stuck at 0.15, dose enough to bring it down to 0.1 and test again after 24 hours. If you're back to 0.15, dose to bring back down to 0.1, etc.
But do more research, don't just take my word for it.