Hi stanleo
Of course you can ask questions, thats the whole point of this thread
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And their are no stupid questions here
1. Yes Carbon should be dosed daily (everyday without fail if poss and possibly before lights on)
I add mine every morning. And No, dosing carbon is not co2 injection.
Co2 injection is when pressurised gas is involved.
Well get to your grasses
2. Dosing iron is fine, it wont effect anything. However iron is normally only dosed seperately like this when people with high light and pressurised systems are trying to keep red plants red. Red plants tend to turn green without sufficient iron and light. With your set up i doubt very much that you will be benefiting from iron to be honest. I personally would replace the iron with a Micro fert and dose that daily instead as micros contain traces of iron. Seachem Florish is a good micro fert seems your already using their products. So not to confuse you, you would be dosing seachem Florish and Florish excel daily.
3. Yes as stated above, if i was you i would dose micros daily and ditch the iron.
Macros are also normally recommended with high tech carbon tanks but if your not getting any deficiencies and you have no algae then its obvious that your fish waste is providing enough of these elements, so you shouldnt have to add them
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If your plants start showing deficiencies (pale leaves, holes in leaves, melting, leaves turning yellow-brown) OR if you get algae break outs, you may want to consider macros.
As for your grasses, it looks like Dwarf Sag??
Dwarf sag tends to stay short in good lighting and grow tall in poor lighting. With that said, even in good lighting dwarf sag will occasionally send the odd tall shoot to the surface. It can behave very differently in different set ups
SLIM