What is going on

[IHaveAquariums]

Alright so. 1 of my 3 angels in my 36g died recently. Stopped eating and started gasping for air. Dead within 24 hours. Now, moving the tank to another room, I found one of my emerald Cory's dead. Everyone else seems alright for now. I have 2 aqueon filters on the tank one with 250gph and the other I'm not sure it's an older model before the led pros and that's all I can find. So adequate filtration. Stock - 2 angels 20ish danios 3 corys 2 nerites and pond snails. I have added salt to the tank as a precaution or extra measure and halved the dose for now. Anything I can do to help/watch out for? My filter media is one of the aqueon pads that came with when I got the tank from Craigslist and the other has a laundry bag with lavarock and a carbon bag too

 

[V227]

As noted previously, your Angel likely died from Columnaris, a variety of very lethal bacteria. The latest casualty could be related. Just keep the tank clean, don't over feed, and ride it out. With luck, maybe no more losses.