Thanks for your opinions. He asked for my advise on it because he's fairly new to this. Getting into it because he never knew of planted tanks and loves my 29gal. Kevmo, I told him the same thing and thats why he passed on it. Told him that a little extra money is worth not having a chance of 75 gallons of water in his living room.
Yeah, I'm partial towards it's best not to risk it.
Especially with someone fairly new in the hobby: combining a potentially flawed tank, typical beginner mistakes, and just bad luck - could add up to a really unpleasant first experience.
Tanks can be expensive, but it's a one-time expense, and can last years (decades even), so it might be worth the peace of mind to shell out for a new (or nearly new used) tank. Lights, pump, stand(maybe?), etc, are probably safer to buy used/damaged.
On the other hand, if he's interested in a riparium/paludarium where the water level would be well below the chip, then that would probably be a great buy. Just orient so the chip is on the corner near a wall or something.
m00se> Just out of curiosity, do you know what causes that?