Carlo that means nothing and speaks nothing about NO3 in the 30, 40 or 60 ppm and dropping it in half. You need to look at the levels HE is talking about. What are they ? Why did you not post a link ?? Do you know how many hits you will get on Kallmeyer, 2004 ?
And he is talking about introducing Zeovit filter system. You are taking a quote out of contents. He does not define anything and you are comparing apples and oranges.
The major advantage of these filters is also their major danger: They remove ammonium very rapidly and extremely efficiently. Although ammonium concentrations are never high (at least they should not be), it is a very important component in the nitrogen cycle. By removing it almost completely, all other processes will be influenced as well. When these filters entered the market, some people underestimated their effects on the overall chemistry of the tank. ***In rather old tanks with higher nutrient concentrations, the corals were well adapted to these conditions and the sudden drop caused massive die-off of colonies that had been growing well over decades. The corals starved and became susceptible to parasites and diseases. If the corals did not starve to death, the parasites killed them.*** It seems that tanks that have started with Zeolite filtration run very well and without major problems, while old established tanks are much more sensitive to it.
I'll say it again 1,000's and 1,000's of people have done large and multi- water changes with out issue. Again, you are trying to force only your opinin, as if noboby elses counts.
