From what I hear, flatworm exit is a good product if you follow the instructions... if we do a 20 gallon quarantine and keep up with it, there shouldn't be a need to buy a nudi. Quarantineing new sand after the initial setup will be the key, I don't see how we can quarantine sand the first time around, just to much of it.

Again, it really all comes down to the hobbyists responsibility, each hobbyist would need to use their best judgement as far as the condition of their tanks, if they have had any problems with flat worms in the recent past, along with aptasia, mejano, mites, and so on, they simply shouldn't donate, since this does NOT keep them from making a withdrawl, there is no reason for them to risk it.