I got a big piece of driftwood for my big tank-it has a 1/2" chunk of slate screwed to the bottom of it. I boiled it as well as I could (it wouldn't fit in my biggest pot) and today put it in the tank and it's STILL floating. dangit. 

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I don't think anything is going to hold this thing down. It's about 12" long and around 4" in diameter. The slate bottom is a good 1/2" thick and probably 5 x 7 or so and still it won't hold it down. The substrate won't even begin to hold it and I don't think I have a rock that big. lol. Don't ask me why I bought such a giant piece of wood.mr_miagi32 said:You could pin it down, or move substrate over it.
Once they dry out, they take quite a while to absorb all that water again. So it just pays to be patient. I soaked my large piece in a tub outside for like 2 months, so it didnt release tannins and so it didnt float. I had to put a brick on it for a while though.
Goodluck, benny![]()