Damselfly nymph

[ryangiggs]

Hi,

Recently i caught a rather big damselfly nymph in my heavily planted tank. It was about 1.5cm long. It must be growing inside my tank for a long time before i discovered it. This could explain the mysterious disappearing of some shrimps... I reckon it might have come hitchhike on plants rather than a female damselfly laying eggs into my tank as they can typically lay hundreds of eggs and i am not seeing that many nymphs.

Now i wondered if there could be more. Is there anyway i can lure them out? Will increasing CO2 force them out to the surface like fishes? Will my fish/shrimp suffer long term effects? Or will any dousing of fertilizers/conditioners have any effects on them?

Thanks.

[genki89]

Is the planted tank shrimp only? If it is not, what fishes do u have?

In any case, if u have shrimp and fish, i doubt the fish are able to consume the pest as snacks (if they do i think some of ur shrimps are their snacks as well)

Increasing CO2 will not really force them to swim upwards gasping for air like fishes (do u observe shrimp doing that?) the best way to remove the pest are all harmful/troublesome.

1) remove all ur shrimps and small fishes and place them in another quarantine tank for at least 3 weeks.

2) 100% dosage of co2 without light on for a period (wipe out all oxygen in the tank so filter gotta be off and removed) or using fishes that actually snack on them (i know parrot fish, angel fish, chichild and gold fish loves them). Last resort is chemical, but u need several water change and using of active carbon to remove all the chemical (ur tank will restart and need a new water cycle again)

3) if the fertilisers and water conditions do affect the damselflies nymph, most likely it will affect ur shrimp the most (copper would most probably be found). But since they are named fertilisers and conditioners, they are mostly shrimp and fish safe. So i doubt its gonna work for ur case.

This are the general guide. Lets wait for the others input

(Ps some damselflies stays that way for up to 1-2 years before they mould and flies)


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