Fish Tank

I bought made myself a fish tank. It is a special one, if I try to change the air with water, I will loose all my fishes.

Model: Koi fish
Author: Riccardo Foschi
Video-tutorial: youtube
Paper size: 15cm x 15cm

Model: Green (?)
Author: Valentina Minayeva
No of modules: 30
Paper ratio: 1:6
Paper size: 5cm x 30cm

Model: Angel fish
Author: Taichiro Hasegawa
Tutorial: NOA 108
Paper size: 7cm x 7cm

Model: Simple fish
Author: -
Video-tutorial: youtube
Paper size: 4cm x 4cm