run down,
female 6 years old about 6 inch
55 gallon tank
fluval 406 canister filter
media bottom to top, course sponge, ceramic rings, thin filter sponge with biorings on top of that, carbon in top. four filter pads along side
water temp 74.5
basking 87-89
FIlter is new about 3-4 weeks now. It turned cloudy and then went greenish within 2 days. I have tried water changes full and partial.
I know it needs to cycle and I tried to let it go but it gets really smelly and that cannot be a good thing.
I went to partial water changes and for the first 2 days its not to bad but 3 - 5th day and I cannot even see my turtle
This picture is day 3 after a 75% water change.
I have had her for 6 years now and never dealt with this so Im at a completle loss as to how to fix it. Help please.

