The colombo doesn't contain iron.
I've used Colombo FloraGrow without issue, and as far as I know it does contain iron, along with all the other traces your plants need
https://www.fishkeeper.co.uk/colombo-floragrow-liquid-fertiliser-for-planted-aquariums
There's perhaps a danger you might be complicating things unnecessarily. Personally, I'd stick with an all in one fert, if cost is an issue use something like
Aquaplantcare's powdered TNP+, a £2.99 sashay makes 500ml, mix it in a jug and decant in to your pump dispenser, easy...
I think it is advised to keep potassium phosphate and iron traces in separate solutions to prevent any reaction occurring that results in an insoluble precipitate of iron (III) phosphate; in short the iron won't be available for uptake by plants. That maybe why Seachem recommend dosing alternate days.
I've looked over your journal, and I think your CO2 flow and distribution also needs optimising. Are you using any other filtration or powerhead apart from the Juwel built in one? I'd also plant a lot more heavily, it will help give your tank more biological stability.
The other questions I have are :-
how/when do i trim my plants?
How do I trim moss so it weeps more?
Is this even weeping moss?(bought offline)
What do i do with my microsorum pteropus, it's not putting out any new leaves and the leave tips have started producing rhizomes leaves and roots. Will upload pics now
Trimming - depends on what look you hope to achieve, but normally when plants become too tall, or start to take over. If you want compact growth it's important to get the right balance between light, fertz and CO2 first. How to trim depends on the plant but take a look at James'
Pruning - A general guide to plant maintenance.
Weeping moss - hard to tell if it is or isn't from your images but check out
Tropica's. As for trimming, just trim it as and when required to the desired length, if conditions are good it'll grow back denser. Personally, I'd take what you have and retie it tight to the wood with nylon thread, it should grow a little more evenly.
Microsorum pteropus - it can be a temperamental plant, I don't think it does change very well, so stable conditions are required to get the best from it. And that brings me back to your CO2 flow and distribution.