Kuhli Loach normally prey at night. Nobody can tell unless they see empty snail shells everywhere in their tank. This is provided they are not well fed. Otherwise they will just leave the snail alone. My shrimp loves to piggy-back on them or even eat alongside my kuhli near to its whisker.
I am not sure Botia loach is shrimp friendly. My shrimps died because the tank space is small (2ft slim tank) after introducing 2 botia loaches. Its speedy motion might be the cause of hurt to my amano shrimps. 3 Amano shrimps immediately took cover and next day turned red and died. My cherry shrimps population going downhill cannot be a coincident. I guess utlimately, you need to have bigger space for Botia to swim because, unlike Kulih Loach which is nimble and agile, Botia Loach are like cory except that Botia will also float mid water level and you need to have space for them to move freely. Otherwise they will bump on everyone that block its way. I have read magazine about aggressive Botia Loach picking on other fish's eyeball in a community tank. However, GC's Botia look like a different kind, more spots and beatifully smaller.
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