I didn't want to offend you OP but I think the two types of wood together looks kind of un-natural and weird. Please don't be offended its just my opinion. To me it looks like you are going for a natural biotope ish looking tank, the wood that you have not put in yet, is not the type one would find in the amazon. The manzanita piece you got from rich would definitely be in the amazon which is why I like it better. I personally think you should turn your manzanita piece sideways and just use it. Maybe get some more pieces from Rich and scatter them in there and leave out the other piece all together. save it for a rainy day, you may need it in the future.