PLA in aquarium?

Is it safe to use printed PLA objects in a fishtank (containing tropical fish and aquatic frogs)?

Safe I am not sure but it does break down. To compost it they recommend that it be moist and around 50c.

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It is safe, PLA won't be composed unles on :
high temperature, virus(bateria),acid value,oxygen.


In normal condition, PLA is hard than PC ,PP.

Don't know but sister in law tried putting a PLA object in the dishwasher and wondered why it melted

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Experimenting in 3D in New Zealand

PLA will dissolve in high alkine solutions, dishwashing detergents are usually very high in alkalinity so thats why it dissolves. PLA is safe in freshwater fishtanks where kh is 0-3dkH but does not do well in saltwater aquariums where the kh is 8-11dkh. There is a product called biopellets in the aquarium industry, and it is a plastic polymer very simular to PLA that bacteria consumes, I would not suggest using PLA inside a fishtank.

only reason I know this is because I used to part-own an aquarium store

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Kreativ-e
Tinkerine Studio

The reason why PLA melts/deforms in dishwashers is due to the hot water.

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-Nudel
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I have printed aquarium stuff in the past but once I have my print I use Smooth-On molding and plastic products to make the object out of aquarium (and reef) safe plastic.