Ah, I see. Yes the three numbers is always NPK in sequence, and they are in per cent.
Tank fertilisation is too cheem for me to give advice on. I have never in my life kept a planted tank using all the advanced fertilisation methods. So I'm just theory crafting and you can't really take my advice seriously. I do plant almost all my tanks, but I take a trial and error and plant deficiency approach. And plants aren't my main focus anyway - it's always the fish first, for me.
I think dosing your orchid ferts along with Flourish and Excel would work, in theory. Orchid ferts supply macro nutrients, Flourish supplies micro nutrients. You just have to figure out how much to dose and how often. And note that your orchid ferts are much higher in P than the usual aquarium dry fert mixes, so if you run into issues, look into whether high phosphate is the cause.
So, about dosing. That 1/8 teaspoon for 75 litres is because I checked Tom Barr's non-CO
2 method (which I linked to in one of my earlier posts), and I trust Tom Barr, who is an expert on planted tanks (note: I realise he did say 2-3 times more with Excel). Why don't you read that thread, because Tom Barr probably explains it far better than I can do?
However, if you want to avoid technical stuff, just trial and error. I've been doing that for years and enjoying my tanks tremendously. Low tech tanks are a lot more forgiving than high tech ones. Your tank probably won't turn into algae central overnight (you're also dosing Excel, which has an anti-algae effect too).
Or if you want to get technical, I think there are lots of knowledgeable people here on AQ who can help you.
Good luck!
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