keep checking regulary as a dead fish can quickly pollute a tank
however i have a betta with zebra danios and they are fine together, is it a longfin one? as that may be a problem. it will also depend a lot on the betta as well i suppose.
however you do need to get a few more danios as if they are in smaller groups they can become nippy and have a go at your bettas fins
-olie
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