Everyone came out to visit today for the water change. Still no signs of any problems on anyone else including the other Hillstream. The fish that passed has been out of the main tank for a week now.
I had already bleached, rinsed, and then soaked everything in a tub with water treated with a ridiculous amount of Prime to make sure all the bleach was neutralized. Better safe than sorry I suppose. I've never had anything like this happen in the year and a half I've had these tanks up and running so I'd like not to have this happen again.
I am a little nervous to start dosing ferts again since that's the only thing I've done different lately other than the non blanched veggie. I know it shouldn't have anything to do with what happened but still makes me nervous.
I'll be keeping an eye on everyone like I normally do. It seems like this was an out of the blue, random occurrence. Here's hoping.