Each is dosed individually, according to the "needs" of the tank, determined by testing levels and charting rate of consumption....
Sometimes more, sometimes less, sometimes not at all...Depends on what the TESTING says the tank "needs"...:yes:
Never "just cause I "feel" like it"...or because someone "told" me I needed it...:nope:
I never, ever, ever, walk up to the tank and say...
"I think I'll throw a couple scoops of "UNOBTANIUM" in there today...I "heard" that's good stuff"....