Nothing wrong with shells. But I got the wrong size for our tanks. Our tap water is between 2 and 3 kh so we need a slight bit more for our snails.
My water has no minerals in it and all my snails and shrimp would struggle. Added one at a time of the smaller size in the 3 pack to my 20L until the last one didn't disolve. Been having an invertebrate explosion ever since.
My hardwater is high in metals, so high I absolutely have to filter it for my tanks, then I remineralize, neutralize, and run buffers like Sera peat pellets in my cannisters. But all of that leads to a lack of calcium - so I like to put in a very small Wondershell when I do my monthly 50% water change. If I did my job properly they leave it alone and it dissolves, if I haven't the invertebrates hit it like it's an Algea tab dipped in repashy and coated in love
These came whole complete and Unbroken which is better than any other order of wondershell I've ever picked up.
Worked liked a charm! Would buy again.
great product for adding water hardness and minerals. Nerite snails love the extra water hardness.