sorry your fish died dude, that sucks 
i would do a 50% water change every day and test the water everyday to monitor how things are going, and with such a large bio load an airstone or some surface agitation would be a good idea.
i would do a 50% water change every day and test the water everyday to monitor how things are going, and with such a large bio load an airstone or some surface agitation would be a good idea.