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Mystery Snail
Pomacea bridgesii
Typical trade / ID note: Pomacea bridgesii (mystery snail; not P. canaliculata, the banned channelled apple snail)
Also known as: spike-topped apple snail, blue mystery snail, gold mystery snail, ivory snail, Spike-topped apple snail, Inca snail, Blue mystery snail, Gold mystery snail
Fishori provides conservative planning guidance, not guarantees.
Based on typical aquarium care sources; trade names can be ambiguous, so details may vary between setups. Use the numbers here as planning defaults — your room, water, and routine still shape real-world outcomes.
A peaceful glass-walker that ignores live plants. Bigger and messier than nerites, with a real bioload and a calcium dependency. Confirm the species at the shop to avoid the banned channelled apple snail.
Best for
Any established community tank 40L or more wanting a large visible snail that ignores plants and does well alongside peaceful fish.
Avoid if
You keep pea puffers, yoyo loaches, or any known snail predator. Very soft acid water dissolves their shells.
Top things that go wrong
- Shrimp & snails. Compatible with shrimp and most other snails except assassin snails.
Common mistakeBuying channelled apple snails sold as mystery snails. They eat live plants and are legally prohibited in several countries.
Easily confused with invasive apple snails
P. bridgesii (aquarium-safe, won't eat live plants) is sold as 'mystery snail' or 'spike-topped apple snail'. P. canaliculata (channelled apple snail) is a plant-shredding agricultural pest banned in the EU, UK, Australia, and New Zealand. Shop labels mix them up. The shape of the shell apex tells them apart: bridgesii is rounded, canaliculata has a deep channel.
What most shops don't tell you
- 1.Pink or white egg clutches cement above the waterline. They hatch in about three weeks if the tank is warm and the clutch stays damp. Scrape or remove if you do not want a population.
- 2.Soft acidic planted tanks. The shell pits within months and the snail dies of shell collapse before the calcium gap is noticed.
- 3.Lid pressed flush to the waterline. Mystery snails breathe air and drown when the air gap closes. A 2 cm gap above the surface is the floor.
- 4.Two non-negotiables. Calcium-rich water (medium-hard or harder) for shell strength, and an air gap above the waterline because mystery snails gulp air at the surface and lay pink egg clutches above water. A flush-fitting lid drowns the snail.
About this species
Mystery snails are large ampullariid apple snails that walk the glass and graze algae and leftover food. They reach 5 cm shell width in a year. Unlike the banned channelled apple snail, P. bridgesii ignores healthy plants and only eats dying leaves.
- Amano Shrimp40L min · same group, comparable tank size
- Ghost Shrimp40L min · same group, comparable tank size
- Assassin Snail30L min · same group, comparable tank size
- Blue Dream Shrimp20L min · same group, similar adult size
- Cherry Shrimp20L min · same group, similar adult size
- Malaysian Trumpet Snail20L min · same group, similar adult size
- Nerite Snail20L min · same group, similar adult size
- Bamboo Shrimp80L min · same fish family
- Amano Shrimpalso beginner peaceful, similar tank size
- Assassin Snailalso beginner peaceful, similar tank size
- Beckford Pencilfishalso beginner peaceful, similar tank size
- Black Neon Tetraalso beginner peaceful, similar tank size
- Black phantom tetraalso beginner peaceful, similar tank size
- Bloodfin tetraalso beginner peaceful, similar tank size
No reverse lookups on file yet.
Plan grid
Key limits are shown above; this section adds planning detail: pH band, swim level, bioload and activity, and the radar.
Swim zones
Planning trait chart
Six indices for comparing species on paper before you spend.
- Beginner ease78
- Peacefulness90
- Community fit86
- Small-tank fit100
- Hardiness76
- Energy54
Numbers are deterministic planning indices from Fishori fields — not a scientific score of your individual fish.
Common setup sketches
Conservative patterns from Fishori fields — still run the pair checker for every species you add; sketches are not a stocking guarantee.
Rough 90L+ layout: one calm centrepiece, 8–12 small tetras/rasboras, 6–8 corydoras-type bottom fish — verify every name in the pair checker before buying.
Safe directions on file include: Corydoras Catfish, Neon Tetra, Harlequin Rasbora.
Tank mate intelligence
Use the "Often compatible" lists as a shortlist, not a stocking plan. Always run the pair tool and check the footprint of your actual tank first. Verify behaviour for Mystery Snail against your own reading before you buy.
Pair-level compatibility with this fish as anchor.
Read the blocking rule on each pair page before experimenting.
Do-not-stock combinations on conservative hobby rules.
Compare with
Run a real pair check: Mystery Snail + Corydoras Catfish
Behaviour, temperament, and what to watch
Prose and lists come from the same record: read temperament first, then glass-level signals so you are not surprised after day three.
Mystery Snail is peaceful in mixed company.
Stress / aggression triggers on file
- Sudden crowding
- Poor water quality
Fin nipping: Not a habitual fin-nipper, but individuals can still test fins under stress or in a crowded tank.
Predation: Not a predator toward similarly-sized community fish. The usual community caveats about mouth size still apply for very small fry or shrimp.
Territory: Not strongly territorial, but still claims a working area in the tank. Give it room to settle without overlapping the next species' patch.
Planted tanks: excellent — easy plant ideas
In the glass: typical and warning signs
- Moderate pacing — not hyperactive, not motionless.
- Clamped fins, gasping at the surface, hiding non-stop, or refusing food after the first week.
- Rapid breathing when parameters swing — fix ammonia/nitrite first, then reassess mates.
- Low listed risk — still watch new introductions.
- Separate or rehome if injuries appear, one fish is pinned, or feeding becomes a daily chase.
- If water is stable but behaviour worsens, reduce stocking or remove the highest-impact species first.
Fish behaviour can vary between individuals and tank setups. Always observe new fish closely after introduction.
Care parameters: water, food, inverts, grouping
Chemistry and group rules sit here so you are not re-reading the same line from tank mate or temperament blocks. Swim level is in the plan grid above.
Hardness
medium-hard
Diet
omnivore
Mixed diet: a quality flake or pellet as the staple, with frozen or live foods two or three times a week.
Shrimp & snails
Compatible with shrimp and most other snails except assassin snails.
One per 40L. They do not need company and a group of five overloads the bioload calculation in any tank under 200L.
Breeding behaviour depends on the species. Research before you buy a mixed-sex group of this fish.
- Hardness above medium and pH above 7.0. Soft acidic tanks dissolve the shell.
- An air gap of at least 2 cm above the waterline, with a partial lid that still allows breathing.
- Sinking foods (algae wafers, blanched vegetables). The snail eats algae but does not survive on algae alone in a clean tank.
- Confirmation from the shop that the snail is bridgesii, not canaliculata. Shell apex is the tell: rounded for bridgesii, deep channelled groove for canaliculata.
- Tank volume meets or exceeds 40L published minimum for adults.
- Heater can hold 18–28°C without cooking cooler-water tank mates.
Explore and stocking hubs
Same library as the rest of Fishori: tank-mate index for this species, category peers, guides, and litre-based stocking lists where min tank on file is within the hub volume.
Plan with tools
Pair-level rules and multi-fish stocking use the same conservative engine — add this fish in the tank builder only after mates pass pair checks.
Filtration & heating
A 40L minimum tank needs a filter rated for at least 160L/hr turnover and a heater to hold 18–28°C reliably.
Plant suggestions
Mystery Snail does well in planted tanks. Plants compatible with 18–28°C and pH 7–8.5:
Profile status: partially verified · Evidence tier: medium · 2 linked source(s). Fishori does not fabricate citations.
Fishori uses conservative planning rules based on these sources.
Confidence is explained in the summary at the top of this page (same tier as here), not repeated below.
How Fishori evaluates compatibility (same logic as pair and tank tools).
- Aquarium Co-Op. Mystery Snail Care Guide
Primary: retailer care guide on tank size, calcium needs, breeding clutches, and the bridgesii-vs-canaliculata distinction.
- Applesnail.net. Pomacea bridgesii
Secondary: long-running hobby reference for apple snail biology, breeding, and species ID; useful for telling bridgesii from canaliculata.
Evidence notes
- P. bridgesii is the only mystery snail commonly sold in the US/EU that is genuinely plant-safe. Channelled apple snails (P. canaliculata, P. maculata) are restricted or banned in most jurisdictions and will shred a planted tank in a week.
- Mystery snails have a relatively short lifespan (1 to 3 years) and produce a noticeable bioload at adult size, which is why the planning minimum is 40L per snail rather than the 20L floor for nerites and cherries.
- Fishori profiles work from typical aquarium trade sizes and hobby care norms. Specialist site checks and literature review for this species are not yet recorded here, so the ranges on this page are planning numbers rather than guarantees.