- Joined
- Sep 19, 2015
- Messages
- 359
- Reaction score
- 166
Long story short - tank has some gha. Hanna phosphorous checker was reading 8 (converted to 0.024 PO4). Sent in an ICP and received it back with a phosphorus reading over 100 and PO4 over 0.3. Borrowed a friends phosphorous checker and both are reading exactly the same thing. Still 8. Originally it read high so I started some gfo.
I am aware that some PO4 can be bound in the GHA. But would this mean a different reading on the ICP and Hanna checkers? Wouldn't it be the same in the water either way?
The GHA is not better and looks to be getting worse. I also have some cyano on the sand now.
NO3 15
Alk 8.3
Mag 1450
Cal 450
Tank is an IM40 running a small skimmer (9004) and floss.
I want to get rid of the GHA, but if I don't know my PO4 levels, I'm not sure how to proceed. I have plenty of CUC.
I am aware that some PO4 can be bound in the GHA. But would this mean a different reading on the ICP and Hanna checkers? Wouldn't it be the same in the water either way?
The GHA is not better and looks to be getting worse. I also have some cyano on the sand now.
NO3 15
Alk 8.3
Mag 1450
Cal 450
Tank is an IM40 running a small skimmer (9004) and floss.
I want to get rid of the GHA, but if I don't know my PO4 levels, I'm not sure how to proceed. I have plenty of CUC.