From what I can decipher from the water data, and your own tests, it seems you have water on the soft side. It is hard to see the colour of the chart, but the test strip seems to be brown, which is soft? The Alkalinity in the water data is 40 mg/l (= ppm) so this is low, which would make sense with soft water.
Now, I don't know your level of knowledge with all this, so I will very briefly explain about soft/hard water. Freshwater fish species have evolved over thousands of years to function in very specific water parameters; they will be healthier with fewer problems if they are maintained in similar water. The hardness has to do with minerals in the water, especially calcium and magnesium. Fish that have evolved in water containing higher levels of these minerals need such water to provide them and for their internal functions to work. Soft water fish on the other hand do not need these minerals, and while some species can tolerate some mineral, other species have more difficulty. Soft water fish kept in hard water frequently do not live their normal lifespan and if dissected thee reason is usually calcium blockage of the kidneys. So it is important to keep in mind the requirements of a species and make sure you can provide such water.
Adjust water parameters can be done, but it is not easy and can lead to other issues. It is always safer to select fish species that are closer to the water you can easily provide for them. They will have less stress, which means a stronger immune system and less chance of contracting disease.
Now, the fish you have mentioned are livebearers (though I am not sure about the "black clown fish"?); platy, swordtail, molly, guppy and Endlers. These fish occur in Central America and Mexico where the water is moderately hard. In soft water they simply will not be healthy and they will not last very long. Mollies are especially sensitive but the others are too.
The fish that should be more "at home" are any of the tetras and rasbora. Many of the catfish. Danios and barbs, but these are often very active and need more space. All of these fish are also what we term shoaling species, meaning they live in very large groups and must have a group in the aquarium, so that needs to be kept in mind when thinking about a species.