Which aquarium treatments are safe for shrimp?

Fritz states the product is safe for invertebrates. Worth noting alongside API General Cure, which uses the same two actives but makes no invertebrate claim at all — the difference is what the manufacturer is willing to state, not the chemistry.

Seachem states StressGuard is safe in a reef or planted aquarium containing invertebrates when dosed as instructed.

Fritz states Expel-P is safe for plants and invertebrates and does not harm uninfected fish. This is one of the clearer invertebrate clearances in the database.

Fritz publishes a species compatibility table that answers this directly: snails and other invertebrates are marked compatible. Shrimp fall under that heading.

Fritz's published species table marks snails and other invertebrates compatible. Shrimp fall under that heading.

Marked compatible in Fritz's species table. Being non-antibiotic, it also avoids the biofilter disruption that follows the antibiotic products in this range.

Fritz states PraziCleanse is safe for most invertebrates, but does not name shrimp specifically. That qualified wording is not a clearance for any particular species, so it is recorded as caution rather than compatible.

Focus is not really a treatment — it binds other medications to food so they are eaten rather than dosed into the water. Seachem frames this as the way to protect delicate invertebrates from medication, which makes it the most useful entry in this database for a shrimp keeper whose fish need treating. But Seachem does not certify Focus itself as invertebrate safe, so this is a strategy, not a clearance.

API makes a general invertebrate claim, but every example it gives is a sessile reef animal and the sentence is framed around reef aquariums. Freshwater shrimp are not named. The claim is real and worth weighing — it is simply not the unambiguous shrimp clearance it is often quoted as.

Seachem contradicts itself on this product. One passage says NeoPlex is well tolerated by invertebrates with delicate species possibly stressed; another instructs keepers to remove all invertebrates as extremely sensitive to medication. Both appear on the same page. Seachem also suggests medicating via Focus-bound food instead of the water column, which reads as an acknowledgement of the risk.

This is the most-asked question about General Cure, and API does not answer it. The product page confirms plant safety but never mentions shrimp, snails or invertebrates in any form. No statement means no clearance — ask API before dosing a shrimp tank.

Widely repeated online as invertebrate safe, but API’s own product page makes no such claim — it addresses the biological filter and nothing else. We will not carry a positive verdict that the manufacturer has not made.

Fritz describes Expel-F as compatible with many fresh and saltwater species but does not name shrimp or freshwater invertebrates. A general compatibility statement is not a clearance for a specific group.

Fritz does not publish a species compatibility table for this product, unlike most of its range. Metronidazole appears in ParaCleanse, which Fritz does clear for invertebrates — but that clearance belongs to that formulation, not to the molecule.

Seachem's Directions open by instructing keepers to remove all invertebrates before dosing. Their FAQ is softer — they decline to certify the product as invert safe rather than forbidding it — but an instruction in the Directions outranks a hedge in the FAQ, so this is recorded as advise-against.

Fritz is unambiguous: remove shrimp before dosing. This is the product that disproves the most common shortcut in the hobby — it contains no copper and is still explicitly unsafe for invertebrates.

Named directly in the warning. Note also that this is a chelated formulation designed to stay active for up to a month, so the tank does not become invertebrate-safe again when dosing stops.

Seachem instructs keepers to remove all invertebrates before treatment, describing them as extremely sensitive to copper.

API advises against use in any aquarium containing invertebrates unless directed by an aquatic veterinarian.

Seachem’s dosing directions for this product instruct removing all invertebrates before treatment. The identical sentence appears across their medication range, so it reads as a blanket precaution rather than testing specific to this formulation.

Seachem’s dosing directions for this product instruct removing all invertebrates before treatment. The identical sentence appears across their medication range, so it reads as a blanket precaution rather than testing specific to this formulation.

Seachem instructs keepers to remove all invertebrates before dosing. Note this warning is broader than the usual copper caution — it is about medication sensitivity generally, and KanaPlex contains no copper.

The directions instruct removing all invertebrates. Note this is the same sentence Seachem prints across its medication line rather than a finding specific to sulfathiazole — the instruction still stands, but it is blanket guidance, not a test result for this chemistry.

Fritz marks snails and other invertebrates not recommended. Shrimp fall under that heading, so this is a remove-the-livestock treatment despite containing no copper.