It is obviously the betta that is killing the guppies.
No matter what people tell you, bettas aren’t community fish and shouldn’t be kept as such.
Especially with guppies. Some bettas can be kept as community fish and it works with some people. Most of the time, it ends in disaster.
Guppies (Male) tales are very colorful and long. This reminds bettas of other bettas. This makes them get aggressive and start attacking the guppies. Once the betta realizes that this is a new food source, he will hunt all of them down on his own good time.
I suggest leaving the remaining guppies in their tank and getting a new 5g-10g tank for the betta.
No matter what people tell you, bettas aren’t community fish and shouldn’t be kept as such.
Especially with guppies. Some bettas can be kept as community fish and it works with some people. Most of the time, it ends in disaster.
Guppies (Male) tales are very colorful and long. This reminds bettas of other bettas. This makes them get aggressive and start attacking the guppies. Once the betta realizes that this is a new food source, he will hunt all of them down on his own good time.
I suggest leaving the remaining guppies in their tank and getting a new 5g-10g tank for the betta.