Mystery snail
Pomacea bridgesii
easy careOverview
Mystery snails (Pomacea bridgesii), a peaceful apple snail, are big, colourful and full of personality — available in gold, blue, ivory, purple and more. They glide over glass and plants grazing algae and leftovers, breathe surface air through a siphon and don’t destroy healthy plants. With calcium-rich water and a secure lid they’re one of the most rewarding beginner snails. Each has visible habits and a surprising turn of speed for a snail, and watching one extend its long siphon to the surface for a breath of air is part of their charm.
Tank & water
A 38 litre (10 gallon) tank gives one or two room and helps dilute their fairly heavy waste. Their large shells make water chemistry important:
- Hard, alkaline water — pH above 7 with real hardness keeps shells solid; soft acidic water erodes them.
- A calcium source — a cuttlebone or mineral supplement prevents pitting and cracking.
- Surface air gap — they breathe air through a siphon, so leave space between water and lid.
- A cycled tank, no copper — cycle fully and keep all copper out.
Feeding
Mystery snails are omnivores that graze algae, biofilm and leftovers, but a clean tank rarely feeds a big snail fully. Supplement with algae wafers, blanched vegetables (courgette, spinach) and quality sinking food. They eat a lot and produce a lot of waste, so feed enough to keep them healthy without fouling the water. A calcium-rich diet and hard water together do most of the work of keeping the shell smooth and thick, so pair regular vegetables with a mineral or cuttlebone source rather than relying on either alone.
Tankmates & breeding
Mystery snails are entirely peaceful and safe with community fish, shrimp and other snails; avoid snail-eaters like loaches, pufferfish and assassin snails. Breeding needs both sexes, and females lay a pink egg clutch above the water that you can remove — so numbers never explode the way pest snails do.
Compare with the algae-specialist nerite snail and the pest-eating assassin snail.
Mystery snail — frequently asked questions
Do mystery snails need a lid?
Yes — mystery snails are accomplished climbers and will wander above the waterline, so an open-topped tank invites escapes and a fatal fall or dry-out. Keep a secure lid with a small air gap above the water, which they also use to breathe surface air through a siphon.
Why is my mystery snail's shell cracking or pitting?
Usually a lack of calcium or water that's too soft and acidic. Their large shells need hard, alkaline water plus a calcium source such as a cuttlebone or mineral supplement. Soft, low-pH water dissolves the shell from the tip inwards and leaves white, pitted patches.
Will mystery snails overrun my tank?
No — unlike pest snails, mystery snails need a male and female, and females lay eggs in a distinctive pink clutch above the waterline that you can simply remove. They don't self-fertilise or breed explosively, so a small group stays easy to manage.
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