Just came home from a 3 day stay at my brothers.I tossed 3 hikari algae wafers in, turned off the lights to my 20g long and left. Tonight I came home and did a 50% water change. I was nearly done when my betta Gyarados came up to the surface and I saw just how sick he was.
2g gal long
terta whisper 20-40 filter w/ active carbon and purigen
unheated however it stays in the mid 70s
3 female platies and a couple dozen fry
2 pgymy cories
12 endlers and their fry.
1 comet goldfish (I know I know he's cold water, however he's a temporary refugee from a fair I worked at a few weeks back. He thinks he's one of the platies and he'll be going to a new home in a week or so.)
Amonnia and Ph to come.
The first thing I saw was the eye. It looks like popeye or a wound, It's bulgy and fogged over. That side of his face looks swollen and mangled. Also his belly is swollen to the point of his scales are starting to pinecone out. There are no symptoms or casualties I can see in the tank other than him. I once caught the big platy nipping him so I think it might have been an aggression thing.
I just put him in a temporary container, about a gallon halfway filled up with water from the tank. I added a dose of hikari betta revive
I've used betta revive in the past with good results, however it wasn't as severe as this. What else should I do?
Sidenote: I am extremely attached to this betta. He actually knows my voice.