Killer Nymph?

[lordofthesea]

ok, well i've recently set up a freshwater invert tank. at first i lost a couple of shrimp (mainly tiger shrimp) but i put this down to a nitrite spike (which i've now sorted out). well i've also lost a few small cherry and long nose shrimp. so, i've just spotted a damselfly nymph in the tank which i've hunted down and gotten rid of. could it be responsible for shrimp deaths. the thing is, i also have some delicate (but also large) snails and larger shrimps (amano's and fan shrimps) in there that are totally unaffected. could the damselfly nymph be the cause of some of these deaths? also, how hardy (and resistant to ammonia/nitrite) are tiger shrimp compared to other species of shrimp like cherries and amanos?

 

[nmonks]

Damselfly larvae are predatory, but I can't imagine them doing much harm to an adult cherry shrimp. A dragonfly larva perhaps, but damselfly larvae are much more lightly built.

Shrimps generally are sensitive to nitrite and ammonia, and this is especially the case with long-nose shrimps, Caridina gracilirostris, which are really brackish water shrimps and not fully hardy in freshwater.

Cheers, Neale