So I've noticed that if I test phosphate directly after a water change I read elevated levels. If I check the next day the levels are more normal to what my tank has been reading.
I'm using the Hanna Phosphate checker, the standard one not the ULR.
In my 116 gallon my Phosphate was at .6ppm, after a 30% water change I checked and Phosphate was over 2ppm. I checked the next morning and it was down to .22. I'm not using a refugium or GFO so it seems that the levels elevate right after a water change. Any idea what causes this?
I'm using the Hanna Phosphate checker, the standard one not the ULR.
In my 116 gallon my Phosphate was at .6ppm, after a 30% water change I checked and Phosphate was over 2ppm. I checked the next morning and it was down to .22. I'm not using a refugium or GFO so it seems that the levels elevate right after a water change. Any idea what causes this?