So in the last week ive bought 14 fish from my LFS and dispersed them amongst 2different tanks thats have been running for about a year now. 4 Rosie barbs, 6 neon tetras, 2 mollies, 2 yoyo loaches. So far, 2 barbs, 4 tetras, 1 molly and 1 loach have died. in my on tank the GH is off by about .5...