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There's easier ways of doing hydroponics where you get a single reservoir to grow in and put in an airstone, it doesn't have to cycle. Look up Kratky Hydroponics if you're interested. I might do it in the future with kitty litter buckets for tomato plants as they would be too large for this ebb and flow type system I built.

As for what happened on your balcony, I would think either you were facing north or forgot to water your lettuce. Balconies don't get much moisture especially if they are on higher floors.

You're right. πŸ‘Œ
I forgot to water the lettuce. πŸ˜‚
Have a nice day.