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heritage · 10/21/2019, 07:04 AM

At this point test results are useless. As long as the algae is in the tank your results will read zero. The algae is using it up as fast as it can.

I delt with the same problem for well over a year till I got fed up and got rid of the rock. I used Marco rock as well and it's nothing but a phosphate factory. Chances are its the rock that is causing your problems.
I ordered 200lbs of Fiji rock, bleached it then cooked and cycled it in a brute trash can for 3 months till there was no phosphate readings. I used phosphate -E a couple days prior to doing a complete water change on the cycling rock. I changed water a couple times a month.

10/21/2019, 07:04 AM	#6
heritage Registered Member Join Date: Jul 2011 Location: PHILLY Posts: 561	At this point test results are useless. As long as the algae is in the tank your results will read zero. The algae is using it up as fast as it can. I delt with the same problem for well over a year till I got fed up and got rid of the rock. I used Marco rock as well and it's nothing but a phosphate factory. Chances are its the rock that is causing your problems. I ordered 200lbs of Fiji rock, bleached it then cooked and cycled it in a brute trash can for 3 months till there was no phosphate readings. I used phosphate -E a couple days prior to doing a complete water change on the cycling rock. I changed water a couple times a month.