i have a 75gal tank with a baloon molly, angel fish, rainbow shark, black molly, blind tetra, and pleco. i already lost a different molly earlier. and my balloon molly and rainbow shark are about to die too. mypleco wont stop jumping and hitting the lid of my tank like it wants to get out. i did a liquid water and and everything is at 0 and the ph was about 7. i dont know whats going on.