Danios are pretty hard to breed, i only have one, but he hangs out with my bloodfin tetra. Id say keep 2 females and a male in a 5 gallon, and just keep the Ph about 8, so a bit high.
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My Tank
38 Gallon: Tiger Barb x5
Serpae Tetra x6
Blue Gourami x1
Bloodfin Tetra x2
Gold Barb x1
10 Gallon: Gold Gourami x1
10 Gallon: 5 Shiners (Wild)
   
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