Hi
I have a 180 litre tank that's has been up and running for 3 months (upgrad from a smaller tank). I had 5 neon tetras, 3 platys, 5 otos, 3 small silver sharks, 6 guppys, 3 mollys, 4 danios and 2 amano shrimp. I added 4 cardinal tetras and 3 cherry shrimp on Saturday and since then 3 cardinal...