Fish Tank-Aquarium Halloween decorative figure. About 10 mm. - 4 1/4 inches tall complete set.
Add a stone, gravel or a metal slab into the rear opening of the weight to avoid floating the set.
Model could have some powder remaining from printing process. Clean it with water before immersing into the fish tank.
Use of Strong Flexible 3d Printed Models with acuatic animals wasn't tested yet.
If you have any doubts about the use of this model could harm your fishes and rest of your acuatic life, better don't use it or make your own security test immersing in short times.
Strong Flexible Material is Polyamide, porous, odorless, water insoluble, colour resistent to fading and don't seems to decompose neither harm or have a detrimental effect on plants, animals or microorganisms. But use with caution and at your own risk.
More info here https://www.shapeways.com/materials/strong-and-flexible-plastic