Yes, but what is the point you wish to make? Triphenyl Phosphate is an ester of Phosphoric Acid. An organophosphate, and is known to not meet the criteria for a persistent, bioaccumulative and toxic (PBT,) or very persistent and very bioaccumulative (vPvB,) substance.
Myth: Plastics can leach just like any other material.
Fact: Most plastics don't leach toxic substances. Once the plastic is hard, it only mixes with substance of similar macromolecular structure. Even if you heat it, it still won't mix with water or saltwater. However, some plastics (Namely #1 and #7 plastics)have been known to leach traces of toxic substances when exposed to microwaves or super hot liquids(water,milk etc).
In more simple terms, styrene is a polymer; since it will not mix in water or saltwater, it is not going to leach anything because to do so it has to dissolve. Just like with the silly BPA nonsense, unless something actually eat the material, it is not going to do any harm to anything. For the record: PVC pipe contains BPA and often TPP, as does ABS.
Let's get real here: neither are causing any apparent problems in aquariums. Aquariums are such a stew of organics (organic compounds/secondary metabolites,) and the small subset of a subset of parameters that are tested for do not begin to tell us what is going on chemically in these systems, that no one could trace an issue anyway. There is no direct evidence to even support the comment that "styrene
may leach phosphate," and there won't be for a very long time—if ever.
As far as "leaching phosphate" and feeding luxuriant algae growth, it is even more ludicrous to believe that hard styrene will leach inorganic phosphate, (the ions H<sub>2</sub> and PO<sub>4</sub>,) without some type of catalyst to trigger a chemical reaction/degradation. (Water and saltwater are not going to do it.)
Polystyrene is very slow to biodegrade, which has made it a target (along with BPA, and several other compounds) that is largely myth driven for effect. However, most of the attention is focused on the "foam" product or Styrofoam. I seriously doubt that anyone would be inclined to put Styrofoam in there tank, however. If one can seriously be concerned over such things, the majority of "egg-crate" is acrylic... it can be obtained from Home Depot...