chip sanft wrote:Interesting idea! I used to have aquariums and love the look of a heavily planted tank. Since those tanks need a lot of light, I think growing useful plants in conjunction with ornamentals is doable. But I'm not sure I understand exactly what you're planning: Do you mean to grow mint etc. directly in the water of the tank? I think that only plants evolved for an aquatic or semi-aquatic life would do well in that situation. Are you thinking of combining the fish water with an aquaponic type medium for the plants' roots? I think that could work well, provided you don't need to dose your fish with medications.
The water itself would be only 15 cm deep, so herbs could grow out of it. I think several herbs would do well in water if they have the chance to grow out of it, for example mint in nature grows next to or in water. Mint, stevia and basil can all grow in a cup of water, but that doesn't provide enough nutrients to keep them alive for a longer period of time.
The whole thing would look like a paludarium. This is the closest to what I have in mind:
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