Ingredient risk record
Praziquantel
Also appears as: prazi
An anthelmintic used against flukes and tapeworms, and one of the few actives that manufacturers do sometimes certify as invertebrate safe. Fritz states both ParaCleanse and PraziCleanse are safe for plants and invertebrates — but that clearance comes from the manufacturer stating it, not from the molecule.
Source-linked caution for
The evidence is formulation associated. It raises a warning on a product containing this ingredient but never decides the verdict.
“Safe for plants and invertebrates. Does not harm plants, other invertebrates or uninfected fish.”
manufacturer page · fritzaquatics.com · checked August 16, 2026
The inference only runs one way
A product containing praziquantel gets a warning. But a product without it gets nothing — no clearance, no green tick. Fritz Algae Clean Out contains no copper and is still explicitly unsafe for shrimp and snails, which is why FishyMag will not certify a product as compatible unless the manufacturer says so directly.
Treatments containing praziquantel
Next steps
FishyMag reports what manufacturers say, quoted and linked. It does not diagnose illness or recommend a treatment, and it never infers that a product is safe from the absence of a warning — where no statement exists, it says so.
Formulations change. Always read the label on the bottle in your hand, and contact the manufacturer if your tank contains anything valuable or unusual.