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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.

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 62 reviews
92%
(57)
6%
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2%
(1)
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M
M.A.
Awesome product. I highly reccomed it to all.

Works awesome the second I put it in my tank. My shrimp apparently like it too because they are all over it all the time grazing off it. I also hear that it will help the shells of my snails. So overall I look at this product as a....

WIN WIN for my tank, my shrimp, and my snails.

J
J.O.
Seems to be helping

I got this to help with shrimp, snails and mollies. I have fairly hard water already, but I've struggled keeping healthy mollies and my mollies currently seem to be doing as good as ever. I'd be curious how much and how it removes chlorine from water. Maybe another Aquarium Co Op video idea?

T
T.
Underrated Product

The wonder shell is one of one the most underrated products on the market! I recently have started breeding mystery snails and after adding wonder shells to my tanks the shells look better than ever. I already have hard water but even use them in my guppy tanks and their colors all look even better.

A
A.
Great!

I have hard water but it apparently lacks calcium. My snails shells were getting white and pitted so I tried wonder shells. They work great! The snails are all over them, eating away. I keep wonder shells in most of my tanks now.

S
S.H.
these are great,

I pop one or two into my 10 gallon tank and recently after actually reading the package, I found out you can use them to scrub algae off your tank! It works really really well! So clean and clear.