My betta is going to die, I can tell the poor thing won't last the night. His illness presented itself the same way my previous betta's did...acting slightly lethargic for one day with no real issues, sudden fin rot (over the course of one day), and then "vibrations" (his whole body appears to be vibrating somehow) as well as sudden paleness. Water changes and aquarium salt either did nothing or made him worse, it's hard to tell. I've moved him from his 10 gallon tank to a one gallon bowl to make him more comfortable, and add a little bit of aquarium salt for luck. I can tell the poor baby won't be alive when I wake up. What on EARTH is this? It's so fast-acting I simply never know what to use....
And is there any other way I can make his last night more comfortable?