the yoyo is about 5 to 6inches and the shrimp was about 2 to 3 inches and in front of my eye while i was observing the shrimp on the bottom roaming the yoyo came up to it and started to bite it, i tapped on the glass and it stun the shrimp to the point a few minutes later it died then they all came around to finish it off. the yoyo first bit took a piece of the shrimp right off. is this normal for loaches to eat this type of shrimp?