Back to the original question, @Coralocean you can pick up some size 00 gel capsules off amazon and some osmocote plus granule fertilizer. Fill the capsules with the fertilizer, close them and place as needed. This is a more cost effective way than going with API or Seachem tabs, but any tabs will work. The osmocote tabs should last a month or two. Generally, broad leaved plants (non-stem style plants such as swords and crypts) show the greatest response to root tabs.
Check out aquariumfertilizer . com's macro/micro mix, I personally use it with no issues. There isn't any Phosphorous in it however, so I supplement with KH2PO4 (dosed directly into the tank as it CANNOT be mixed into the macro/micro solution. KH2PO4 is also sold by aquariumfertilizer . com).
Because of your higher pH, many nutrients may be converted into less available forms for plants, so look into some Flourish Iron and Flourish Comprehensive.
In my low tech tank I follow the directions from aquariumfertilizer . com to make up a solution, and then dose 1mL of solution per 10 gallons of tank water. You could cut this down slightly to 1 mL per 15/20 gallons if you have a light plant mass. I then add a pinch of KH2PO4. After a water change I'll dose some Flourish Iron and Flourish Comprehensive.
If you skip a day or two, no big deal, it does not call for big water changes, so your regular weekly routine should work well. Keep the solution in a fridge or add a few mL of excel/metricide and store in a DARK area. One pound of ferts should last you a long time.
When I had a high pH tank, Rotala rotundipholia, vallisneria, sagitteria, crypts, hygrophila and java fern always did well for me. Swords and anubias not so much. Perhaps look into a few of those and see if you like them? They are all ~ low light and fairly "easy" to grow.
