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Atlantic Rush

Shellstrong Premium Calcium Block for Aquatic Turtle - Slow Release Water Conditioner - Turtle Calcium Cuttlebone - Turtle

4.3(31)
$9.49

75+ bought in the past month

About this item

  • Essential Calcium for Turtles: Formulated to support healthy shell and bone development, this calcium block for aquatic turtles delivers consistent nutrition to help prevent common calcium-related conditions such as metabolic bone disease.
  • Slow Release Calcium Formula: Our advanced slow release calcium design gradually dissolves in water, providing a steady and controlled supply of essential minerals without clouding the tank or creating waste
  • Ideal for Aquatic Turtles & Reptiles: Perfectly suited for aquatic turtles, amphibians, and other reptiles, this versatile supplement helps maintain optimal health in a variety of habitats with no special setup required.
  • Improves Water Quality: While enriching your turtle's environment with calcium, the block also helps neutralize harmful acids—making it both a source of nutrition and a water conditioner in on
  • Easy to Use, Treats Up to 20 Gallons: Each 0.8 oz ShellStrong calcium block treats up to 20 gallons of water. Simply place it in your turtle’s tank and let the slow release calcium go to work—no mixing, measuring, or mess.

Key details

color_spec
White
Brand
Atlantic Rush
Item Form
Block
Manufacturer
Atlantic Rush
Pet Type
Reptile

Dimensions and fit

dimensions
‎ 1 x 1 x 0.5 inches; 1.45 ounces
weight
1.44 ounces
item_weight
1.44 ounces
item_package_dimensions_l_x_w_x_h
6.22 x 3.9 x 0.91 inches
item_dimensions_lxwxh
1 x 1 x 0.5 inches
size
1 Calcium Block
product_dimensions
1 x 1 x 0.5 inches; 1.45 ounces

Technical specifications

item_model_number
AR-Turtle Calcium
model_name
AR Turtle

Item information

date_first_available
November 11, 2025
brand_name
Atlantic Rush
target_audience_keyword
Reptiles and Amphibians
directions
Place Shellstrong slow-release calcium block into your turtle's water habitat. The block will gradually dissolve, helping to neutralize harmful acids and improve water quality while slowly releasing essential calcium into the environment. Treats up to 20 gallons per treatment.
color
White
included_components
Calcium Turtle Block
specific_uses_for_product
Outdoor
best_sellers_rank
#16,294 in Pet Supplies ( See Top 100 in Pet Supplies ) #240 in Aquarium Water Treatments
Highlights

About this item

  • Essential Calcium for Turtles: Formulated to support healthy shell and bone development, this calcium block for aquatic turtles delivers consistent nutrition to help prevent common calcium-related conditions such as metabolic bone disease.
  • Slow Release Calcium Formula: Our advanced slow release calcium design gradually dissolves in water, providing a steady and controlled supply of essential minerals without clouding the tank or creating waste
  • Ideal for Aquatic Turtles & Reptiles: Perfectly suited for aquatic turtles, amphibians, and other reptiles, this versatile supplement helps maintain optimal health in a variety of habitats with no special setup required.
  • Improves Water Quality: While enriching your turtle's environment with calcium, the block also helps neutralize harmful acids—making it both a source of nutrition and a water conditioner in on
  • Easy to Use, Treats Up to 20 Gallons: Each 0.8 oz ShellStrong calcium block treats up to 20 gallons of water. Simply place it in your turtle’s tank and let the slow release calcium go to work—no mixing, measuring, or mess.

From the brand

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Product videos

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Customer reviews

31 reviewsPositive

Rated 4.3/5 across 31 reviews — well received overall.

  • 75% of sampled reviews give 4–5 stars.

Customers say

Customer summary is not available yet.

Reviews with images

Customer review image for Healthy turtleCustomer review image for Easy Calcium Boost, Shells Look Better Already
See all photos
★★★★★

Healthy turtle

Turtle seems more healthier and moving around better Read more

Customer review image for Healthy turtle
joseph brooksVerified purchase
★★★★★

Lo recomiendo

Muy recomendado si tienes tortugas en casa Read more

Muy contenta ,a mi niña le encantoVerified purchase
★★★★★

The turtle liked it

Simple item. It's smaller than the cuttlefish bones I usually give our turtle, but it seems to be denser. We dropped it in her tank and it lasted about a week before it was all gone. Our turtle seemed to like it and she's still alive and kicking so it's a win in my book. Read more

J. A.
★★★★★

Easy Calcium Boost, Shells Look Better Already

My turtle shells started looking off, and I had no clue how to fix it. I did some digging online and found this premium calcium block. It was exactly what I needed. My tank’s 55-gallon, but I only keep about 20 gallons of water in it, so the block is just the right size. I tossed it a couple of weeks back, and the calcium started dissolving right away. Now, about two and a half weeks later, their shells look shinier and a lot healthier. The block dissolved completely in about 4 days, which is slower than the ones I used before. The instructions couldn’t be easier: just toss it in the tank and let it do its job. They recommend adding one every 2–3 weeks, though the package only comes with one. Still, I wish everything were as simple as this. You can even use it in outdoor turtle ponds—just one block per 20 gallons, and you're set. If you want steady shell support without extra hassle, this calcium block is a solid pick. Read more

Customer review image for Easy Calcium Boost, Shells Look Better Already
Donithon Houston
★★★☆☆

It dissolves

Great product, your turtle will eat it but it’s just a supplement so it’s alright. Just put it somewhere else so they won’t get to it Read more

T’Aja GordonVerified purchase
★★★★★

Snails are benefiting from it

After I dropped this in my fish tank I checked it a week later. The block was intact still with some of it dissolving on the bottom. My snails seem to be benefiting from it. The size is great and doesn’t make the calcium levels skyrocket. It was really easy to use and you could break it up with some effort if you need to split it up between smaller tanks. Read more

Heather
★★★★★

Boost your turtles health

Love this for my turtle tank. Will it turn him into a smceetain cartoon ninja situation worth of stregnth?! Only time will tell. But for now it will help his water and she'll health and that's also important (I guess. Although it would be cooler if he turned into a superhero). This is very easy to use and gives your shell baby tons of health benefits for a low cost. I'm not a vet and can't really give official health advice but turtles need vitamins too! They deserve to be as healthy as live as long as possible so I think this is very worth trying. Read more

Emily Simpson
★★☆☆☆

It dissolved into a winter wonderland

Wont let me add a picture but boys tank looks like a winter wonderland after putting this in.... white dust coating everything and water is cloudy...I've bought this a few times in the past but has never did this....now is it actually working for the turtle? Idk lol is it working on making the tank messy? Yes. Read more

kimVerified purchase
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