As for the wood that you're going to get. I've heard mixed reviews on grapevine driftwood. some rot faster than the other. I would also be cautious when it comes to wood that they sell in the reptile section. First, reptiles don't need anything dense(in the sense that it's sink-able). Second, the manufacturers sometimes apply special coating onto the wood, chemical additives such as calcium and what-not since they promote the healthy growth of their skin. These chemicals are big NO-NOs in the aquarium as they alter the water chemistry and would eventually lead to the death of the fish. One thing for sure is that Mopani wood is always a safe and easy choice to go by. They're dense and sink faster than most other woods. They also release less tanin than other woods. The Malaysian driftwood is, arguably, the best driftwood out in the market at a heavier price tag. They're dense and sink quickly. They have all sort of shapes and sizes that hobbists crave for when decorating a planted aquarium. The downsides to these driftwood are that they release more tannin (thus discoloring of the water) and that they're not always readily available in petstores. You can check out Petco and see if they have any. I've seen Petco carrying them but the sizes of those woods are not big at all. You can always test your luck and what-no. If not, Mopani is your second best alternative IMO