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To take your points -

1. Plants feed through both their roots and leaves, though some types feed mainly through the leaves and others through the roots. Heavy root feeders such as Amazon swords and cryptocorynes need root tabs, stem plants need liquid fertiliser.
It's mainly ammonia from fish which provides nitrogen for plants. Ammonia is preferred over nitrate as plants have to turn nitrate back into ammonia to use it, which wastes energy.

2. The best lighting for plants has a K rating of 6500. Do the fixed spectrum bulbs have a K rating on the tubes, or even the manufacturer's website? The adjustable light needs red, blue and green. Too much red or blue will encourage algae to grow.

3. That depends on the plants. Easy, low light plants don't need as much as plants which need extra things like CO2. Start with 8 hours. If the plants grow long and thin, they need longer timing or stronger light. If the plants are growing fine but alsgae starts to take over, reduce the timing.

Agree with the others on the whole.  Also, 10% of a tank tends to be taken up by substrate and decor, so you should input your tank size as ~112 litres to work out its stocking capacity.  If there were a powercut or the filter were to malfunction, there is more scope for problems if a tank is heavily stocked.  To clarify/extend H's point, although the stocking calculator takes into account the adult size, fish do better and grow more which is healthier for them if they are not restricted by their environment / crammed into too compact a space for them. 

As for which fish to opt for, a couple of additional points that spring to mind:
* neon tetra are best suited to soft water, although their range is 18-225; however, if your water is very hard, then best not to have those;
* zebra danios are best suited to long tanks of 90cm+ for swimming length as they're active fish, whereas your tank is 81cm length.

If it were my tank, I'd probably have 8 cherry barbs, 8 rummynose tetra, a shoal/6+ cories (peppered or one of the species M suggests), but omit the neon tetras and zebra danios and feature fish (or include a mated pair or a group of the pearl gourami if space allows).

Edited to add: I was assuming you meant that your tank was still empty but has been cycling for the past 3 months, that these are your proposed fish, and that you're talking about your maintenance regime per se (eg as per for your 1st tank), rather than that you have the tank already stocked like this.  In hindsight, I realise that perhaps the tank is already stocked..?

I also have 2 tanks

My 220ltr aqua oak with canister filtration.  This is reaching a point where it needs a bit of time putting into it (time I don’t have at the moment with a 4 and a 1 year old at home!). Fish are perfectly healthy and water changes done every few weeks of about 20% (I know I should do more but it’s not heavily stocked and that seems to keep things on the straight and narrow!). The need for time is partly a me thing - the scape has become very anubias heavy and looks a bit unruly, the rocks and wood need a really good scrub. I have thought about replacing the wood completely but not taken the plunge just yet. Still looks decent overall and I like that it’s low maintenance. My main fish (though I seem to have quite a few ends of shoals currently) are the 2 angelfish, the 2 Bolivian rams and cardinal tetra. I would like to get some harlequins or increase the number of ember tetra - not sure which way I’ll go just yet.

My 60ltr marine macroalgae tank. The number of species of macroalgae has dwindled a bit, and I want to restock these. I was having a big struggle with cyano but am getting on top of this now. Fish are healthy - the purple and yellow royal gramma being the star of the show. My next challenge is to tame the massive growth of green star polyp (coral) which has massively taken over - the majority of the tank in fact. I recently bought some new rocks for the tank so a rescape is probably looming! There’s some great critters in here - cleaner shrimp, boxer crabs that hold anemones, anemones, hermit crabs, snails, pistol shrimp. I probably enjoy them as much as the fish and macros!

8 Neon Tetras and 8 cherry Barbs!

Hi Ben, welcome to the forum.