Trying to stop a full fish crash. Help

I have a ttached some images this we 15 min ago fish is now also gone as of 5 min ago.

 

thinking this might be the cause. It also says tank must remain fishless for a min of 4 weeks to get rid of the parasite. Well I guess im going to tear down in the next week or so and start redoing my lr and whatnot. I have never had any exp with bacteria infections in my tanks or with any fish but this is the ony one I could find with pic that mimic this horrible thing.

http://www.chucksaddiction.com/brookynella.html

 

Sorry to hear you having to deal with this. Good luck with your restart.

 

The ONE parameter that I was concerned about reading your initial post was your pH level. What was that and how many hours had your lights been on when you measured it? Ultralow pH causes burned gills, scales, and eyes