Hello Kurt,

yes, i have in all my tanks, where is more water, a filter. In the small one, a small filter in the tank and in the big one a filter outside.

I have nowhere activated carbon in my filters. I don't like it - in the filter from my aquariums, i put it not in the filter.
Why?`Do you think, the toxid from the amphibians and the activated carbon make problems?

And the toxid from the two amphibians make realy no problems.

Nice greetings,
Irina