Any dead creature in the water will putrefy and the resultant putrefaction will kill any fish in that water. So yes the dead crab will kill the Betta eventually.
no because male betta's are really aggressive to other betta's which plakats are male's. but female betta's can stay with other females. don't try to, one of your betta's are going to end up dead.
get rid of it or flush it down a tolette
it's dead!
flush him down the toilet.... then get anthor one if you want
Probably because it's dead and going rotten.
The white fins wont be moving and they will be at the bottom of the tank
If you put a dead one on top of the water they might nip it
Playing games with fish if very diffucult. The best thing to do with your betta is to put your finger on the fish bowl and move it around to see if your betta will follow it. If she does, that means she is hungry. Feed her. Not hungry? Then just talk to your fish, though I must warn you, they might not be very sympathetic. BUBBLES ROCK!!!! EVEN MY DEAD BETTA FISH (Beta, Troy, and Fin) ROCK!!! EVEN MY DEAD GOLDFISH (Max, Elizabeth, and Liz) ROCK!!!!
Betta's are super Territorial once they see another one they go for the kill and one they do their is no stopping it they stop until one is dead even with cory catfish's the will kill anything ( fish) in my book their the king of the world ( and by world i mean tank) so i wouldn't even risk it weather male or female a betta is a betta
noooooooooooooooooooooooooooooooo!!!!!!!! never put a female in with him unless you have experienced with them for years like me and i still have dead females come out and i have done it for years
they float belly upl... they float belly upl... float and, you don't really need to know because it will be easy to tell that it is dead.