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Also know, is Styrofoam bad for fish?
Styrofoam is made with some pretty evil chemicals including formaldehyde. Formaldehyde is partially used in some medications, such as a lot of ich treatements, but levels are crucial for the fish. The same is true of copper, it's dangerous in tanks, specially for invertebrates, but is still used in meds.
In this manner, is polystyrene toxic to humans?
Polystyrene contains the toxic substances Styrene and Benzene, suspected carcinogens and neurotoxins that are hazardous to humans. Hot foods and liquids actually start a partial breakdown of the Styrofoam, causing some toxins to be absorbed into our bloodstream and tissue.
Styrene which is what is used a lot for filters and other aquarium components is highly toxic. Its ok until its heated and it will release gases. Styrene gas is deadly. Polypropylene and polyethylene is safe.