It will never hurt doing this, but most plants have similar Fe needs, thye might take uop a lot more than they actually "need", eg Hydrilla has an optimal growth rate at 6ppm of Fe, but does well at 0.1ppm.
You need to relate growth rate to Fe to determine if they really "Need" more or not, which has never been done for about 99% of the aquatic plants.
So folks eye ball things.
There is an obvious problem with anecdotal evidence and poor controls, or rather, a complete lack of controls.........
So take advice with a huge grain of salt and follow a basic flow chart for what causes growth=> light= > CO2=> N=>P=>K and so on down the line.
Then you cover your bases much much better and become a much better aquatic plant grower.