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Welcome to Reef 2 ReefCan Seachem Purigen interfere with cycling? Week two and remembered I brought it over and is in my return bag.
I would start the product after a couple weeks down the line, maybe after the cycle is done, right before you add some fishI cycled with Dr. Tim's and then seachem stability every day for over a week. Live sand and live rock. I moved the sock over from another tank because the installed one on my sump was tiny during set up and I was not paying attention until i was messing with my Marine pure Biomedia block and noticed it was in there and felt dumb. just was worried i was selling myself short this whole time.
I would not use it ever. It alters ammonia and nitrates and you would not be able to properly test for these parameters anymore. When the filter is about to dye may get swings in parameters.

Sorry, that is not correct. It does not "alter" them, and even if it did bind them directly (it doesn't, at least from seawater), you are not getting any sort of "false" reading. There would just be less in the water to detect (which is presumably the goal).
Purigen binds organics and you might see a reduction in nitrate since you are potentially intercepting organics and removing them before they break down to release things like ammonia which can be converted into nitrate.
Perhaps you are thinking of Seachem Prime? That does "alter" ammonia, although I don't consider that a problem since it also made it less toxic by the same amount.

