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Originally Posted by little
I dont know if this is right or not, I was told once that to find out if something is safe to put into a fish tank pout vinager over it, and if it bubbles its not ok. What about brackish? can sea shells and silver dollars , that kind of thing go in?
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Silver dollars as in the fish? If so they are freshwater. 
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If you have a big enough tank with enough hiding places, pH of around 7, you can keep virtually any fish together as long as all the fish are around the same size and these two groups of fish are avioded:
Serrasalmus
Tetradon(figure eights and dwarfs are the
exception).
I keep a successful community of fish in a 4 foot tank including the following families:
Cichlids, tetras, loaches, gouramis, barbs, rainbows, livebearers, killiefish, catfish, puffers.
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