Hey I have a 70g planted tank that was healthy and thriving with 3 rainbows, 2 tetras, shrimp ant 2 otos. I bought 5 angels last week without properly inspecting them and realized almost immedietely after releasing them that they were sick. When I called the pet store back they refused to return them. I didn't have the heart to flush them and now four of them are dead and one of my rainbows is starting to act weird and has a white "pimple" on the top of his head. I treated with kardon Ich attack to no avail. I am new to fish diseases so please can anyone help me before I lose all of my fish. I am desperate because it seemed to kill the angels very fast!