Aquarium is a good idea but bathtubs might be the simplest options.
Transforming flat roof into gardens is of course a good solution but there is nevertheless a weak point to this. Several will ultimately fall down on your head as they are not built for that and as they will be damaged by the water (+ the additional weight). Therefore, if you want to do that, don't forget to do some transformations or be unforgiving with your PCs.
I like the idea of transforming basements and parking lots but I'm not sure it works. I would assume that most species need light but I might be wrong about that. However, basements would be perfect to grow mushrooms.
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