I've never had large tanks as I rent and smaller tans = easier to find landlords willing to accept them, but I do prefer shallow over deep. My salt tank is only 10g so really how deep could one even go...lol.. But I recently went from 20L to 20 tall with my planted tank as the plants needed more height, but the 20L was/is still my favorite.
I also like shallow as it's easier to light without breaking the bank.
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