CaribSea ARM Calcium Reactor Media Extra Coarse 1 Gallon
CaribSea ARM Calcium Reactor Media Extra Coarse 1 Gallon
ARM Coarse Reactor Media contains calcium, carbonate, and trace elements.
Nearly 50x the Strontium of other brands (7390ppm)
Precision grading allows for maximum carbon dioxide penetration
No gastropod shells mean the lowest phosphate content (less than 1/10th of 1ppm)
The highest solubility of any reactor media (metastable at 8.2)
One of the most trusted media for calcium reactors in the industry. The media is a complete solution which includes both calcium and carbonate as well as essential trace elements.
The media comes in two forms Coarse and Extra Coarse.
Coarse – larger size granules which are less likely to clog equipment.
Extra Coarse – Largest size granules and the least likely to clog equipment which results in the lowest maintenance option.
Feeding & Diet
Feeding & Diet
An opportunistic omnivore, the Pithos Crab will scavenge detritus, uneaten food, and algae — making it a natural cleanup crew member. Supplement with small meaty foods like mysis shrimp or pellets 2–3x per week if natural food sources are limited.
Care & Water Parameters
Care & Water Parameters
The Pithos Crab thrives in stable, well-maintained reef conditions. Target parameters: temperature 72–78°F, salinity 1.025–1.026 SG, pH 8.1–8.4, and alkalinity 8–12 dKH. A mature, established tank of at least 20 gallons is recommended.
Reef & Tank Compatibility
Reef & Tank Compatibility
Generally considered reef-safe. The Pithos Crab coexists well with most corals and peaceful fish. Use caution with very small invertebrates or slow-moving tankmates. Provide ample rockwork and hiding spots to reduce territorial behavior.
Size & Growth
Size & Growth
Pithos Crabs are typically shipped at 0.5–1.5 inches. They are slow-growing and generally remain small, making them well-suited for nano and mid-size reef systems.
Shipping & Live Arrival Guarantee
Shipping & Live Arrival Guarantee
All livestock ships with heat or cold packs as needed and is packaged for safe transit. We stand behind a live arrival guarantee — if your animal arrives DOA, contact us within 2 hours of delivery with a clear photo. See our full DOA policy for claim details.
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