Request/WCIF Aquarium That Looks Like A Pond

Sort of.

I do it by making a nice pond (usually using several of bakie's water effects) and then stock it with a variety of fish from either bakiegaming (modthesims) or cool1 (naughtysimsasylum - not actually naughty, or nsfw in any particular way).

There's plenty of guides for making your own ponds, or I'm positive there's ones you can download off the gallery.

Maybe I'll put one of mine up next time I'm in game.