Plantex CSM+B is 6.53%
Fe. CSM+B with extra
Fe from Greg is 10%
Fe. Using a formula and dose that gives .1ppm
Fe with CSM+B will give .153ppm
Fe with CSM+B+Extra
Fe. This isn't very high and is a good target to start.
If you want to solve for your own mixes, just remember
ppm is
mg/L and cancel units. I find its easier to start with the mix first to get concentration. I made the variables italics in case its easier, as its easier to understand with units.
mg Plantex plus extra Fe * (.10mg
Fe/
mg Plantex plus extra
Fe)/
mL water =
mg Fe/mL trace mix
Then move on to the target in your tank:
(
target ppm *
tank gal * 3.77L/
gal)/(
mg Fe/mL trace mix) = mL dose to reach target
ppm
So lets say you use 10g (10000mg) of Plantex CSM+B in 250mL: each mL of your solution has 4mg
Fe. Say you have a target of .2ppm
Fe in a 30gal tank: you would need 5.7mL of your mix. Say you want to add 5mL of your mix into a 30gal: you're dosing .176ppm
Fe.
In terms of fish and inverts, too high
Fe is said to cause death. A ceiling of .2ppm is considered safe.
In Ecology of the Planted Aquarium, Diana Walstad suggests limiting
Fe will limit algae, and some attribute thread algae to high
Fe. Tom Barr has dosed very high
Fe and has not induced algae, but also thinks high
Fe is no more beneficial than high traces. Lots of hobbyists dose
Fe chelate alone to get better color from their plants and dont induce algae. You'll need to experiment to see for yourself.