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i've had my cherry barbs for the past week or so and i only have 3 of them left because they like to play with the bubbles and then they get smacked with some of the decorations and hurt and die!
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Something is definitely wrong. Cherry barbs are tough, fast-swimming little guys and no airstone should knock them around. They should be extremely active and very greedy for their food.
Did you get them all at the same place? It's possible they were sick when you got them.
Are they being harassed by the bigger fish? Cherries are quite timid and they may be afraid of the Tiger barbs and shark, and unable to compete for food.
As for the shark, have you tried putting a pellet in front of his castle after you turn the light out?