I've used coffee grounds on my garden plants for years, but never tried it on a potted plant. You've got a wide variety of plants there with very different needs. I'd go slowly at first and see how the various plants tolerate the coffee grounds application. Maybe mix some coffee grounds into your water once a week or so and water with that.
Coffee certainly is a sterile organic additive and it's a great amendment for soil in the garden, but in a pot, you could get to a point of "too much of a good thing" fairly quickly. Any way you can compost the coffee grounds with the rest of your kitchen veggie and fruit waste? There are small composters available that can be used on a deck or balcony.