TexGalI used the iron for 2 big bottles worth. It precipitates in the water. I didn't have that issue with Florish Fe. Brightwell is cheaper but I don't want a cloudy tank 4 days out of the week so I'm switching back. I haven't used the others.
Did you use the weekly or daily dosing regimen? To me at least, this is one major attraction - the ability to dose it once when you leave for a week for vacation.
I am using it in my outdoor container so its hard to appreciate the cloudiness if any,