leave countries out of the debate. it's about filtration and reducing/eliminating nitrates. i'm not from either country, but it's uncalled for, especially when all of our countries, friends, families, etc have been hurt or killed for the same things.
keep on topic or don't chime in.
as for my personal experiences with lowering nitrates, you cannot go wrong with plants. i have a planted tank that holds its own and can go for extended periods of time without water changes, just top offs. i clean it roughly once a month, if that, and haven't had a fish death in over a year, and that was due to bullying.