Ok, many questions here. I am a fish and invert person and there may be a better answer for you but.....
nitrate doesn't bother fish?
Fish can tolerate higher nitrates for a long period of time, but still will do better in the long run with nitrates lower than 20 PPM
. In a qt
setting like the one mentioned above, it is not a reason for concern with the relative short time the fish will spend in this environment. I don't even test for nitrates in a qt
how bout corals? whats the point of water changes then if high nitrates dont matter? i mean i know to keep trace elements and stuff. but how come everything says to keep nitrates under 10 then?
Corals cannot take the amount of nitrates that fish can tolerate. Below 10 PPM
is highly recommended in a reef tank.
Also water changes are a must for more reasons than nitrate control. Trace elements are recharges in every water change as well as the dilution of pollutants such and nitrite, niitrate, PO4
and ammonia. Basically they add trace elements and reduce DOCS, thus routine water changes are very much a part of the basic care of your marine system.