i agree drilling is the best solution. You don't have to drill the bottom, you can drill one of the sides like a semi hydro pot (one hole though). You can use eggcrate to create a false bottom so your plants don't touch the reservoir of water and avoid using the hydroton which will block the hole you drilled. Use a bulk head to attach a hose for drainage.
Or, you can avoid draining,and create a small corner pond, that is, an area where you can see and access the water with turkey baster and suck the water out when it accumulates too much.
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
Goblin Market
by Christina Georgina Rossetti
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