Posted: Wed Aug 15, 2007 10:02 am
"Turtle Clean" is one I have used with a lot of success in the past. But for a larger tank, you will end up going thru quite a bit of it and the stuff is not cheap!
Find a salt-water aquarium store & find out what kind of bacteria/enzyme additive they use for the large tanks in the store. They have the more concentrated stuff & it works great for the larger-than-50-gallon tanks. It works for fresh & saltwater fish so you don't have to worry about it not working for a turtle (The fish are WAY more sensitive to water quality than turtles....that's good news for us).

Kristin's Pond! Starring:
RES = "Sheba", 21+ yrs. old
African Clawed Frog = "Prog", 10 yrs old
& "Kristin" as Momma