I have 5 Electric Blue Jack Dempsey's. I think a spike in PH killed one of my Elecric Blue Jack Dempsy'. Over the last 2 days, up to 8-0 seems to have done him in. Any other experiences like this? I started readg this evening what causes PH Spikes. Should be interesting. I'm trying to set up the optimal environment for these fish, seems like it might be difficult.