Eheim filters

and only because I can

All biological filters are per definition 'Nitrate Factories' because the
sole point of having a biological filter is to convert ammonia into nitrite
and then nitrite into nitrate.

"All" should have been most, most filters that encorporate biological filtration only do
nitrification (create nitrate) while there are several that do denitrification also, more
so sw tanks have the advantage of being able to get denitrification from LR and a DSB
these are both biological filtration, in that they use bacteria to process waste.


Ammonia is very lethal to fish, nitrite is
somewhat less lethal to fish but will still kill'em, but nitrate is
relatively harmless to fish but should still be removed via water changes or
heavy planting (whish will use some of the ammonia and nitrite directly by
the way...)

heavy planting is good but doesnt work all that well for most marine tanks, not to say it
doesnt work its just usually more of a pita than its worth.


--
Richard Reynolds