I am a new member, but driftwood is pretty straightforward. You want the malaysian driftwood if you have soft acidic water, or want it. (that is a benefit of driftwood - it buffers your pH at 6.5 or below if it is good. on the contrary, if you want your pH to be 7.0 or higher, you should avoid driftwood.) The "leaking" occurs if the driftwood piece is overly large and has not been soaked for awhile and therefore is not really driftwood. Pet stores should sell driftwood, and if you buy it, get the stuff already in tanks if you are worried about toxins - if they are in with healthy fish then there are no toxins.