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Originally Posted by FDStation152
the lego house is a pretty good idea although I wouldnt rule out the idea of it floating off somewhere. While the shell can raise your pH and co2 will definitely lower it so it might not be such a bad idea to have it in there anyway. The shell would work just fine for the idea and would be much easier to pin down .
buffering is what keeps your water pH stable. otherwise it would almost constantly drop as fish waste was added to the water. shells naturally buffer the water to a higher pH due to the calcium they contain. carbon dioxide injection lowers the pH due to the formation of carbonic acid. The shell may somewhat help keep the pH from falling to a level undesirable for the fish.
while they are indeed safer I highly doubt that one shell is going to take the tank beyond the "desirable" range fast enough to harm the fish. In fact my main tank has a whole lot of old malaysian trumpet snail shell slowly breaking down and the pH hasnt deviated from 6.5 in more than 2 months of daily testing. His tank is also pretty crowded so the more he uses whats already in the tank as opposed to adding stuff the better. And i have a strong suspicion that the ol lego house will hold enough of the co2 and end up just floating on around the tank lol
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