Black neons are usually very peaceful fish, I have had mine for over 7 years and never had a problem. I have however found invertebrates such as shrimp quite difficult to keep they do seem to be much more sensative to water quality and the minerals in your tank. I do add Aquarium salt if I'm keeping invertebrates. I would also have though with 12 Neons your tank is fully stocked and the shrimp might have been too much. I'm not sure but 19 creatures in the tank seems alot. For example my tank is 90 litres and I have 4 neons, 4 black neons, 2 glow lights and 1 male guppy with 3 females plus 4 babies. I have a separate tank for other guppy babies. I use http://www.fishforums.net/ http://forum.practicalfishkeeping.co.uk/ http://www.tropicalfishforums.co.uk/ this one is particuarly good.
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Topic: Aquarium Advice
they'll help you with all aspects of your tank 
