These shells are great for adding hardness into your water and work as dechlorinator as well! Often times we need more minerals for our snails, shrimp, plants, goldfish and african cichlids tanks. What size you need depends on your aquarium. We recommend testing your water and adjusting based on water change schedule. 

Here are some very loose guidelines:
3 Pak - 1 shell per month for 5 to 10 gallon aquariums.

2/5 Ounce - 1 shell per month for 20-30 gallon aquariums.

1 1/3 Ounce - 1 shell per month for 40 to 55 gallon aquariums.

2 1/4 Ounce - 1 shell per month for 75 and larger aquariums.

Wonder Shell

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These shells are great for adding hardness into your water and work as dechlorinator as well! Often times we need more minerals for our snails, shrimp, plants, goldfish and african cichlids tanks. What size you need depends on your aquarium. We recommend testing your water and adjusting based on water change schedule. 

Here are some very loose guidelines:
3 Pak - 1 shell per month for 5 to 10 gallon aquariums.

2/5 Ounce - 1 shell per month for 20-30 gallon aquariums.

1 1/3 Ounce - 1 shell per month for 40 to 55 gallon aquariums.

2 1/4 Ounce - 1 shell per month for 75 and larger aquariums.

Customer Reviews

Based on 70 reviews
93%
(65)
6%
(4)
1%
(1)
0%
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0%
(0)
C
C.E.
Great product

So far so good. Has been in my tank for about a week and everyone is still happy. Thank you!

F
F.R.
Snails love them

These last quite some time in my tanks, they do not break down and dissolve quickly like all other calcium chips I have bought else where. The price is fantastic too, cheaper than amazon too! Thanks!

C
C.w.
Great product

It's a great product I think they will help the water quality of my tanks how ever they only lasted like a week it said they would last a month hopefully once I build up the minerals in the water from wonder shells I'll get a longer life span out of them