mellowvision
Seafood Lover
even with bigger/better magnets, I think you're going to have an issue keeping those jars in place. The glass is so heavy on it's own... and they're a lot taller than you need, so there is a lot of extra gravel too. Starting off with plastic would be a better start, as would using shallower planters that are vented. I've got plants in both vented and unvented containers in water, and the vented ones grow better.