first of all get rid of all the gravel, very bad for turtles ,they will eat them,,second thing is you have to let some good bacteria build up in the filter, I had the same problem, my son worked for a tropical fish store, and he kept telling me to do that, I was hard headed , finally gave in, now i only change water 2 times a year, I have a fluval 404,you have to let it get a little murkey before it clears right up

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