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Please tell me how long I must dry dock for and for how many days. The reason is fungus growing on his shell.

I would where you found your info to dry dock follow there instructions precisely on there method of antifungal treatment. Provided that you have corrected the improper / unhealthy habitat that caused the problem in the first place or fungus will just come back and worst !

Thanks I have fixed my problem which was lithe uva and uvb light whic has definitely already been improved.

I asked for the info here as where I got the info failed to mention for how many hours per day

Usually the more the better, but a lot of that depends on your individual time and the conditions you keep the turtle in.

Ok thanks