In my opinion, it would be the South American Red-Tailed Catfish. It grows up to 8ft. and I have one at home, and he is 3ft. so far. I'd say any type of catfish is hard to kill.
Yes. Most strong bases (pH above 9) can kill a fish.
A cockroach.
to kill himself or not to kill himself
Yes, Betta Fish are extremely aggressive and they will most likely kill your other fish.
snail
its obviously fish kill means dead fish ..
Fish kill means fish creek simply means die-off of the fish
no a water pump can not kill a fish
well not exactly if you want to kill your other fish then........sure! why not? if love your fish, why kill it?
If the jar has water in it with the fish, you will kill them.
Yes, chlorine is harmful to fish and can kill them if they are exposed to high levels of it in their water. It is important to always use a dechlorinator when setting up a new aquarium or performing water changes to make the water safe for fish.
Plastic decorations can kill fish if they are dumped in to the ocean. (the decorations not the fish)