Tie the fork with a string and anchor the string on the outside of the tank. Ugly, yes, but easier to remove. Also works for lettuce, eggplant, carrots, hibiscus flowers, arugula, sweet potato... blah blah. Fork on string can stand up to keep veg at any level in water. Only barely helps to keep (#@!!*!&!) headstander from eating every scrap of good plants.
A