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You only need Flourish Potassium, as needed, in an aquarium. Potassium will be the limiting factor to growth in most aquariums. But with shrimp in the tank, I would dose it at 1/4 strength once every 2 weeks or more. Seachem Flourish for micro nutrients at half recommended dose every other 2 weeks in between the Potassium. But !! I don't believe you will need too much ferts in your tank. The type of plants and the amount of plants do not warrant much ferts at all. The waste from the fish and shrimps will be enough ferts, and if they are getting enough light a day, the plants will be fine without any additional ferts, except maybe a little potassium once every few weeks.

O.k rethink. If I use that Salty Shrimp GH/KH stuff. Can you recommend any good fertilisers I could use for the plants? I'm not dosing anything at the moment.

Not going to lie, this is giving me a headache. Just want a nice planted tank with fish and shrimp. ? At the moment it looks like it have to either pick 1 or the other. Would this be a solution. Use Seachems Equilibrium and KH products to bring my GH and KH up to 4, then use that Shrimp King Mineral Fluid Double, to bring the GH up to 6. That would make sure that there are at least some minerals for the shrimp.

Oh boy, where do I start? Anything you add into the tank can potentially cause pH to rise and fall. Anything organic, like rocks (can cause ph to rise), wood or leaves (can cause ph to fall). Even some filter media have been known to change pH, like certain ceramic filter noodles. But even if you added nothing or did anything ... the natural cycle of bacteria breaking down ammonia into nitrite and nitrates causes a reduction in hydrogen (H) atoms, and thus pH will fall. But since this cannot be helped, regular monitoring is needed and water change to bring, the pH and other parameters, back into a suitable range for Caridinas. Don't let it scare you off however. You have already been doing a great job with the Neos. It's just an extension of that, with a slight tweak in the water parameters.