has anyone calculated the amount of flourish fertilizers their tanks require
and then mixed large quantities of various flourish types together (like
flourish potassium + flourish trace + flourish) in the proper proportions.

Yes. I e-mailed Seachem and asked them if it would be okay to do that, and
they said to go ahead. So I do. :-)

Also I ordered a bottle of flourish iron but it says I already get iron from
normal flourish so I doubt I will be adding this.

I use it. IME, Flourish alone doesn't provide enough iron.




Leigh

http://www.fortunecity.com/lavender/halloween/881/