According to my Ammonia test kit it's about 0.5. I do have ammo chips already in-use though. I redid the test strip again and it's still giving me the same results 0 nitrites and 0 nitrates.
Like the others stated, I think the root of your problem is that your tank isn't cycled yet.
The cloudy water and sick fish are probably from the ammonia.
I have never used the bio starter stuff you mentioned, I don't know how effective it is.
The beneficial bacteria will grow anywhere in your tank. Bio filters are designed to give the bacteria very conducive conditions for it to grow and colonize.
Like stated by the others, removing the ammonia will greatly increase the time the bacteria takes to establish itself.
Not removing the ammonia will have a detrimental effect of your fish until the bacteria establishes itself.
I have never used prime but have heard many people praise it.
Ammo chips have a limited life span. Hopefully as they peter out the bacteria will flourish and the amount of ammonia your fish will have to contend with will be minimized.
The little Cascade Powerfilter 100 is probably too small for your stocking level. Replacing it with a bigger filter right now isn't going to speed up the beneficial bacteria... But I would add it to the list of things to do eventually. When you do upgrade the filter you will want to run the Cascade for a few weeks along with the new filter while the bacteria propagate to the new filter.
As the others have said the murky water is probably an algae bloom. The algae is feeding on the ammonia and in this respect it is beneficial to your tank and fish.
You best bet might be to a couple gallons of water a day and wait it out until the bacteria takes over?