Insect Intruder in Tank - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 11 Old 07-02-2008, 10:03 PM Thread Starter
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Insect Intruder in Tank

I was cleaning my tank today and I found a large insect swimming around in the side filter compartment! I have a 75 gallon freshwater planted community tank. Its about 2 1/2 months old.

The little critter is about the size and appearance of a dull black/brown yellow jacket wasp without any wings. 6 total legs, no pincers that I can see.

The bug is in a normal size shot glass.

Any ideas what it is? Could it be detrimental to my smaller fish?

Any info would be much appreciated,
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post #2 of 11 Old 07-03-2008, 08:38 AM
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Blah, thats gross, haha it makes my skin crawl.

There was a post almost exactly like this a while back, the bug looked slightly different though. But it was in a big planted tank. You might want to stir around your plants a little and see if you can find anymore.

I couldn't tell you what kind of bug this is, but its just a little larva and won't cause any harm to your fish, if anything its a little extra protein for them.

Haha, I just looked up dragon fly larva to see if that could be one.. And I found a rather interesting picture.

But unless you have little tiny minos or fry swimming around your tank I wouldn't be to worried about these little creepy crawlies.

And just before you laid dead weight upon its shores, I stung you in the face for that's the nature of my core.
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post #3 of 11 Old 07-03-2008, 02:57 PM Thread Starter
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Not good, my bristlenose just spawned and there were several .5-1 cm fry in the side filter with the insect.

Well, this is definitely the little booger right here:

Definitely a dragon fly larvae. I wonder how many of the baby bristlenose it got.

Suppose he rode in on one of the plants from the lfs and has been having a time of it in the aquarium for the last couple months. Strange stuff. I'll have to keep an eye out for more of them.
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post #4 of 11 Old 07-03-2008, 04:11 PM
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Thats not good news at all! Did you manage to save any fry?

When was the last time you added plants? It could be possible that a dragon fly got inside and laid eggs in your tank or something.

Definitely keep your eyes open for more.

And just before you laid dead weight upon its shores, I stung you in the face for that's the nature of my core.
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post #5 of 11 Old 07-03-2008, 04:47 PM
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Yeah, if you don't have a lot of surface agitation and/or a good cover, dragonflies and other bugs will lay their eggs on the surface of your water. Definitely a good time to suck up any weird looking stuff on the top of your tank!
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post #6 of 11 Old 07-03-2008, 06:20 PM Thread Starter
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I believe I have around 5-10 fry left. Its hard enough to get one of the tetras out of the side filter, so I have my work in front of me for the tiny plecos.

Any recommendations for a nursery? I would like to keep the fry in the same tank. I was thinking one of those 5 sides nets and maybe a floating plant for them? This is a first for me, and the breeding was not any intention on my part. Those frisky little devils!

Its amazing to think that a dragonfly might have gotten into the house and then found the tank, but its possible. The cover and lighting unit has spaces where insects could fit in. The water surface is pretty agitated though. I have to use a net to distribute food underwater, otherwise between the water cascading into the side filter and the outtake for the under aquarium, the water is constantly moving.

Thanks everyone!
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post #7 of 11 Old 07-03-2008, 08:28 PM
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How are all these fish getting in your filter? Lol.

A side net would work, You can't keep the fry in there for too long though, it can become stressful as they grow. A floating plant is a great idea.

Congrats on becoming a new parent :D Your pretty lucky, I thought it would be difficult to get plecos to spawn. They must be pretty happy.

Good luck raising the little guys, don't get discouraged if you loose some though. Raising fry is pretty hard, I raised like three batches of swordtails before I got any to survive, and even then only one made it! I got luckier with my guppies though, the only two I found survived.

Seek and destroy all of those nasty crawlers

And just before you laid dead weight upon its shores, I stung you in the face for that's the nature of my core.
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post #8 of 11 Old 07-03-2008, 09:47 PM
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You may want to get one of these:
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post #9 of 11 Old 07-04-2008, 12:07 AM
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Dragonfly nymph indeed. Bad news.

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post #10 of 11 Old 07-04-2008, 11:37 AM Thread Starter
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Yeah I don't know if I have a strange fish tank, or what. It was a hand-me-down. There is a compartment on the left side of the tank. It's located within the rectangle of the main tank. It is all sealed and makes a box about 7 inches x 7 inches in the back left corner. It goes from the bottom of the tank to near the top. There are holes at the top (now screened over to make less hole space) that allow water to cascade to the bottom of the compartment where there is a circular sponge filter. The water is then drawn into a 20 gallon tank under the main tank that contains bio-balls. Then the water is drawn back into the main tank through a hose and comes out of an outtake hose, creating a current.

Occasionally some of the smaller fish make it through the screening and into the side compartment. I know the previous owner has several fish that ended up in the compartment, and due to his laziness, stayed there for several months to no apparent harm. I'm sure it stresses the fish though. Fish over an inch can't really fit though the holes.

Well its good to here I'm doing things right. If theres some bom-chick-wawa with the plecos, its good to see there happy. Definitely lurked on fish boards like these for a while and learned a lot of great info. Keep up the good work guys and gals.
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