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i have a 80 gallon tank, i have 4 black ghost knife fish, i heard they need driftwood to live happy.
 

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What Black Ghost Knife's need is more cover than roughage. Driftwood will provide cover and look good. They are sensitive to light and skittish.

Be aware, a BGK can reach two feet in length so if you're planning on keeping these fish you're going to need a bigger tank.
 
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