I've tested a few types of grapevine in the past (I really like the look of some of the lizard "jungle gym" pieces for dwarf cichlid tanks).
In every instance the grapevine started to rot - it got visible patches of fungus or bacteria (think cotton ball) and when I pulled it out it reeked like low tide (very strong hyrogen sulfide smell too)...
At least in my experience it isn't aquarium-safe (the malaysian wood is, though).
And not ALL Petco's are bad - in my neck of the woods (New England), more than a few prominant members of the local Aquarium Society work part time in the fish departments at Petco, which allows them to help alot of people.
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Just "Red"
(Paulhus is my lastname  )
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