09-02-2009, 02:01 PM
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I agree with Lupin, and I've frequently written on this in other threads. Here's a copy from the last one for your info, brandielissa.
Fish absorb water through their cells (that's how they drink). The fish must regulate the pH of its blood to equal that of the water it lives in. When the parameters of the water stray outside the preferred range for the particular fish in respect of pH and salinity, it needs to work extra hard to maintain the pH of its blood, feed its tissues, and keep its immune system functioning. Adding salt increases this effort considerably, and that causes stress which can lead to poor health, immune system problems, disease, parasitic attacks that the fish would normally fight off, and even death. The damage can be done over time and not show up until its too late. Laura Muha wrote well on this in an article in the Dec 2006 TFH, and she compared it to driving a car up a steep hill--it takes more gas and the car has to work harder internally. So does the fish. Salt does not belong in a freshwater aquarium.
As we are here in the Anabantoids section, salt would be very bad on these sensitive fish.