Can shells be put in the tanks
I wasn't sure were to post this. But a friend called and asked me to come online for her and find out.
Can shells be put in her tanks as decorations. She's heard 2 different things. She's been told not to because of the calcium released as the shells decompose, but then she was told it won't hurt her fish at all.
Any help would be appreciated. Thanks
Calcium isn't harmful to fish. A lot of folk add calcium to their tanks for snails and it's perfectly safe. I'm not sure however that shells do release calcium. Prhaps somebody else who has used them will be able to confirm this?
i hear (rumour) that shells in freswater tanks are a no no,
i think they do release cacium, but i think they really change the PH aswell. (this was something i THINK i read somewhere long ago so take this advice with a grain of sand)
I've had shells and even large barnacles that I found snorkling in my tank. If it changed the PH it wasn't enough for me to notice or hurt the fish but the did slowly dissolve. If you put them in there you might not want to put in your favorites because they will slowly dissolve into nothing.
most shells from sea mollusks are made up from
an outer layer of the horny substance conchiolin, an intermediate layer of calcite, and a smooth inner layer composed mainly of calcium carbonate.
as this decomposes in water it releases lots of pure calcium that will raise the pH. it will also release carbon dioxide (CO2) that again adds to the raising of the pH.
with a few small shells this effect will be negligible but too many and you could have problems
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