I've been using grapevine in my tanks and for the most part have had minimal issues with it. I've got 1 tank where I used really big pieces--bigger around than my arm and 3 feet long, so I wasn't able to boil them before use. I've had nothing but trouble with this one tank and I think it's crud leaching from the wood. I'm going to replace the wood.
I've seen that several people have used manzanita in their tanks. I want to use big pieces again, so I won't be able to boil them. For those using manzanita, how long did it take to settle into the tank (quit leaching)? For those who've had it in their tanks for a while, how is it holding up?