The Big Kill (with CO2). Was - D*mn it. Damselfly hatched in tank. - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 02-14-2013, 01:59 AM Thread Starter
Algae Grower
 
Join Date: Jun 2007
Location: River Falls, WI
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The Big Kill (with CO2). Was - D*mn it. Damselfly hatched in tank.

I'm re-starting my 200 gallon heavily planted tank - high light with moss, swordplants, anubias, hairgrass. I'm trying to make it more of an ecosystem than a "fish tank" - I'm growing all kinds of critters in it right now (cyclops, daphnia, MTS, worms in the substrate, etc.) Once I get it all stabilized I'm going to add just a couple of small cichlids, probably rams, & let them go to town & see where everything stabilizes.

Right now the tank is in the "extreme green water" stage. Which is OK, because I've got daphnia & cyclops in it.

Problem is I opened up the cover today and found a newly molted damselfly.

Not the kind of critter I wanted in the tank.

It obviously hitchhiked in on some plants I put in the tank, either as an egg or larvae (along with the cyclops and lots of other small crawlies I don't mind).

I don't know if I've got more. I have no fish, and so I suppose I can just wait until any larvae hatch and die in the canopy. But there's no way I could ever see them or catch them if they're in the larval stage, even if I didn't have green water. Too many plants & rocks.

Or should I just remove enough of my invertebrates to restock and just wipe out all (animal) life in the tank? If so, how?

Last edited by cheesehead; 02-16-2013 at 10:34 PM. Reason: Change in title.
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post #2 of 7 (permalink) Old 02-14-2013, 02:05 AM
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Do you have a co2 canister? If so just run it on max for a few days and everything will be suffocated
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post #3 of 7 (permalink) Old 02-14-2013, 02:11 AM Thread Starter
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Quote:
Originally Posted by xdestry View Post
Do you have a co2 canister? If so just run it on max for a few days and everything will be suffocated
Hmmm... that's an appealing option. Won't hurt the plants... Running on "max" I'd probably drain my cylinder - any idea about a target CO2 concentration? I can set the controller to regulate to a specific pH & CO2 concentration...

It would also help me get rid of the pond snails whose eggs apparently also hitchhiked into the tank.

Last edited by cheesehead; 02-14-2013 at 02:45 AM. Reason: just edited
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post #4 of 7 (permalink) Old 02-14-2013, 04:08 AM
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Not sure of a specific concentration, but a 200 gallon is pretty large so you might have to run it pretty high to get it to levels where nothing can breathe inside.
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post #5 of 7 (permalink) Old 02-14-2013, 05:53 AM
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I had the unfortunate experience of damselfly nymphs in a shrimp tank. Shrimp were happy and reproducing like rabbits, but the population suddenly (drastically) started 'going south' in a matter of two months. Could not figure out what was going on until I removed a large clump of needle leaf java fern. I decided to shake the clump out over an empty bucket just in case any shrimp were trapped inside the giant mass of fern. To my surprise, a DF nymph ended up in the bucket. Bingo ~ figured out why my shrimp population suddenly declined.

Definitely some tough critters. From my understanding, they can remain in the nymph stage (underwater) for a year or more until fully grown. I ended discovering a few more throughout the fishroom and was able to physically remove them. They are experts at hiding within plants, and from what I found out, they do a lot of their predatory hunting at night time. If you do have nymps in your tank, I'm pretty sure they are feasting on your cyclops & daphnia.

I've heard that shelter traps have had some success (e.g., overturned clay flower pots, etc.). Had a friend tell me that crays solved his damselfly nymph problems. Never tried chemicals or CO2, so I don't know if it would help your situation or not (although, if in strong enough concentrations, I'm sure they would definitely "do" the deed - but don't know what other types of collateral damage would result). Maximum CO2 injection sounds like an interesting solution. If you go this route, let us know the result.
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post #6 of 7 (permalink) Old 02-14-2013, 06:12 AM
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More than likely there aren't a whole lot more of them. I would just leave everything be and if there are still a few they will just develop like you say and once they molt out as adults and that will be the end. I don't think they would be able to reproduce in there very well.
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post #7 of 7 (permalink) Old 02-16-2013, 10:32 PM Thread Starter
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Going with the CO2 route... Just took a small picking of snails and enough other critters out & put them in their own 55 gallon tank. My own little ark.

With luck I'll get rid of the pond snails that have also hitchhiked into the tank.
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