How much Iron to dose?

[cgcaver]

First of all, I do NOT have an Iron test kit nor will I be buying one. Ive heard they are expensive and extremely inaccurate.

I have 2wpg (the 2x55w Bright Kit from AH Supply) and no CO2 injection. Heres a list of the plants I have (as far as I know):

2 Marble Vallisneria
1 Amazon
1 Rubin Sword
6 Dwarf Chain Tennellus
2 Red Temple
2 Moneywort
1 Ruffle Sword
1 Anacharis
2 Cabomba
2 Brazilian Swords
2 Lilies (water onions)

I just got the complete Flourish line from Big Al's and on the Iron bottle it says dose to 0.10 mg/L (which is 1 cap for my tank), and to maintain that level. My question is - Does anyone have a rough guess as to how often I will need to add the 1 cap of Fe to maintain close to 0.10 mg/L? What is the iron uptake gonna be like? Do I need to put in a capful every day? Should weekly cover it, or monthly?

I know this is question will only produce vague answers, but Im really only looking for guesstimates. Thanx all!
_________________
~ Gabe

Black Tiger Oscar - currently 4"
Pictus Catfish - currently 4"
55gal w/ AC500
Hooray for sand and live plants!

 

[malkore]

Typically every other day. Iron oxidizes to an unusable form rather quickly.

However, you're not at high light, and you don't have CO2 injection..so I'd start at a half dose every other day, and just watch the plants.

 

[cgcaver]

so since it oxidizes fast, im assuming its hard to overdose it?

 

[TankGirl]

You can overdose it so be careful. Start off very slowly and watch the plants - they will be your best indication.

 

[cgcaver]

so what will they look like when they need iron? And please dont say "brown".... a lot of deficiencies could make them look bad... is there anything that will specifically indicate that they need Iron?

 

[czcz]

Bookmark worthy: http://www.csd.net/~cgadd/aqua/art_plant_nutrient.htm
Chuck's Planted Aquarium Pages owns.

 

[BASSNMAN]

I recently got a redsea Fe test kit from big als, It wasn't very expensive and seems easy to use. I started adding Tropic master grow to my 50 gal at 2 ml daily. By the mext morning it indicated no iron. I upped the dose to 4 ml, still no residual overnight. I upped the dose to 8 lm and now have a residual of .1. Iron deficient plants look pale and the leaves of my amazon sword looked transparent. They are much improved now.