The blue crayfish seems to contaminate the water a lot. The water in the 20 gallon tank was unclear and smells. One factor that may be important is that we removed from that tank a plecostomus and 3 corydoras, which help to clean.
We thought days ago to separate it due it violent behavior. We got gravel (white) and some stones to suit the crayfish in the small 10 gallon tank. I was thinking to do that tomorrow but this night I heard a splash and when I look at the 20 gallon tank the crayfish had a angel fish grabbed from the dorsal fin (upside down), as the fish tried to escape the lobster tear all it fin, the fish swim away dizzy, staying in a odd position for a while. It probably was half sleep as the crayfish try to get it. I turn on the light and feed them to make them go to the surface.
I set up the small aquarium right away and now I’m finishing of clean the 20 gallon tank. Tomorrow pictures.
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