So i recent had 9/10 neon tetras die after i added the last 6 to bring me to a total of ten. after talking with some people here i assumed it was neon tetra disease. The only one who survived was the one i removed from the tank. so yesterday i went out and purchased 4 male guppies. Immediately after adding them to the tank, one swam and hid by the heater under some plants (great sign). he disappeared over night, i cant even find his body. Assuming the amano shrimp got to it. Then after my 25% water change a couple hours ago, i had another guppy floating upside down and had to euthanize him. When i removed him, i did notice some blood on his face. My dwarf guarami does have a mark on his face, so im really starting to wonder if hes turned into an ***hole and is killing my smaller fish. i did see him swim up to one of the guppies and "kiss" him, so it really has me wondering. I know theyre supposed to be realatively peaceful fish, but can turn violent under certain conditions. It's a 20 gallon high tank, water parameters have been steady since i started stocking about a month ago. Shrimps and snails are molting and laying eggs, pleco is doing great as well. ph-7.5 nh-.25 no2-0 no3-5 kh-6 gh-13 temp-76 I know the .25 isnt great but ive dosed prime for tank volume twice this week, and dosed the water i use for changes when i mix it. Im really getting frustrated and sad. Any thoughts?