cloudiness in a 55 gallon half filled north American biotope

[REDTAILPUPPIES]

so, I have a huge problem. I have 55 gallon, a native biotope with a yellow belly slider, a bullfrog tadpole (accidental), and a juvenile bluegill. I did a water change, and the water was cloudy. its been 2 weeks and it refuses to clear. should I do another water change, or is it something else?
(sorry that the pictures ****ty, and ik the glass needs to be cleaned)

 

[troublesum]

Is that a new tank? to me its looks more like a tannin leak

 

[Deadeye]

What is your regular water change rate? What’s your filtration?
Turtles are incredibly messy and will need a lot of work to keep up.