Ammonia doesn't affect turtles the same way (gill function) however it can irrate the skin and eyes at higher levels.
How has the tank now cycled? If there is ammoinia in the water bacteria should be thriving on that by now. I have a turtle with a heat lamp and a UVB lamp and the tank is fully cycled.
Maybe his water has chloramines in it and if not treated will not allow the proper bacteria to grow. Turtles can handle much high nitrates then ammoina, even more so then fish. Even if he does not change the water allowing to cycle whould improve the turtles health.
On a side note for some reason my turtle tank which has been set up for 2 years will only grow brown algea, no other kinds. I'm not complaining just thought it was interesting.
How has the tank now cycled? If there is ammoinia in the water bacteria should be thriving on that by now. I have a turtle with a heat lamp and a UVB lamp and the tank is fully cycled.
Maybe his water has chloramines in it and if not treated will not allow the proper bacteria to grow. Turtles can handle much high nitrates then ammoina, even more so then fish. Even if he does not change the water allowing to cycle whould improve the turtles health.
On a side note for some reason my turtle tank which has been set up for 2 years will only grow brown algea, no other kinds. I'm not complaining just thought it was interesting.