Big floating food ring

I tried several store-bought floating feeding rings, but they all eventually absorbed water, sank, and failed to keep the food contained.
To make matters worse, for my 180-liter aquarium, every single one turned out to be way too small!
This model has an true size suitable for aquariums over 100L: 174x120x12mm.
Less plastic + more trapped air = perfect floating ring!

Print settings:
Infill: 5%
Solid Layers Top: 3
Aolid Layers Bottom: 2
Perimeters: 2

PS: use universal suction cups, like these https://aliexpress.com/item/1005006926172567.html