Simply adorable, thanks for sharing these awesome replacements.

love it, thank you! )

Lol, I was just thinking about trying to do a default replacement. Thank you for this, looks great.

Looks great!

Thanks!!!

This is so great! They're so detailed! Is there a specific process in replacing the fishes if we want to customize our own aquariums? I feel like I want to make a freshwater aquarium and all aquariums in TS2 seem to be with saltwater fish.

If you'd like to make your own defaults, you can edit my file. Open it with SimPE and replace each texture with yours.
You could also export and modify each mesh in 3D software to correct the shape - use .obj file format.
Look up tutorials for making default object replacements. It's easier than creating new CC (and I already did a part of the job ).

I especially like the pink seaweed, it's a nice touch.

Thank you so much!