crimsonecho
Self-Proclaimed Don Quixote
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Your roots are sitting in the water. It is not good.What parts do you think need to be upgraded?
Also, why do you think it is not healthy?
Leaves looking downward. They are drowning in the water.
You should start again and make a new design. You can find easy setups in the internet and on this site. Use them to make your own system.
Right now, it is too late. If you want to save those seedlings get some soil and put them in it.