It is a very good up date.
One of the best ways to drop the po4 is to try carbon dosing and also water changes. Try to blast the rocks turn off all the flow and then syphon out all the gunk off the rocks.
Also I have done this with my algie problem, I took a clam shell or a rock and put it over the algie, left it alone for 2 weeks and then the algie died off. Dipped the rock and then back into the tank for another black out of the algie.
One of the best ways to drop the po4 is to try carbon dosing and also water changes. Try to blast the rocks turn off all the flow and then syphon out all the gunk off the rocks.
Also I have done this with my algie problem, I took a clam shell or a rock and put it over the algie, left it alone for 2 weeks and then the algie died off. Dipped the rock and then back into the tank for another black out of the algie.