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Fish Loverrr.
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I have a round spotted shell in my 29 gallon freshwater tank. My tank now contains 5 tiger barbs, 3 red minor tetra & 1 rainbow shark.

Well, I have a question about this shell. I put it in there because it looks nice but does it affect the water quality? I read that shells can release calcium into the water.

Is this true? Does having this shell in my tank cause the GH (General Hardness) to be higher then it would be if this shell was not in my tank?

OH! & another quick question: Tropical freshwater fish such as tetras and barbs prefer soft water right?​

Thanks in advance for any replies to this post.
 

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Yes shells will slowly leech calcium into the water of the tank
 

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tetras, S.A. generally soft water, but varies by species.
barbs, Asia, generally moderate hardness, but varies by species.

If your water is very soft, the shell will eventually dissolve (takes decades, but you may see holes in a few years). It could raise your gH but it will be a small amount.
 
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