I'm back!... and in need of help. [Worm/Larvae ID]

[Y3H]

Hello fellow dear AQ bros and sis, hope all are well while I was gone :P I'm finally back to stalking AQ and what's better to return to AQ than to bomb all the masters here with questions?

Ok here's the story, my dad has been cycling a 1 feet tank (fishless cycle) for 1 month plus at our balcony. Upon being cycled, we introduced 2 guppies today and found quite a number of these unidentified worms/larva! Here are the pictures.

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Some observations about this worm/larvae.

1.It destroyed my plants' leaves and wraps itself with the leaves, forming some sort of cocoon to hide inside.
2.It is very hairy

Now here's another twist to the story, thanks to my dad's itchy hands :P, there was a cross contamination (transfer of plants) to my newly scaped 2 feet tank that is still under going a fishless cycle. And here are the pictures of the plants that the worm destroyed.

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As you can see some of the plants got their leaves stripped and their stems are left bare. And to top it all of, I caught a damselfly nymph from the 1 feet tank.
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Therefore...

What is this worm/larvae?
Is it the initial stage of a damselfly nymph?

What worries me is that there is more than a damselfly breeding in my tank; and hopefully it does not belong to any malaria/dengue mosquitoes.

So far I have removed what I could from the 1 feet tank, hopefully my 2 new guppies could prevent eggs from being laid. I'm continuing to monitor the tank for damselfly nymphs.

As for my 2 feet tank, I can not introduce any fishes as it's still undergoing a cycle. I vacuumed most of the plants and substrates for the 'leaf cocoons' and did a 80% water change. Also monitoring for any foreign invaders.

In an related experiment, when I introduced the worm + its cocoon to my pond filled with Rosy/Cherry Barbs, the fishes seem not to detect the worm. And when I managed to extract the worm and reintroduce it back to pond, the fish instantly responded and ate it. So it was quite interesting that the worm uses aquatic leaves to protect itself.

Phew, that was a long story. I hope I have not bored all of you to sleep. I appreciate any advice and possibly any identification of this pest and any actions to exterminate it.

Thanks for reading!

[Trichopsis]

What you've got are caterpillars!

Some species of small moths have caterpillars that feed on aquatic plants. I've dealt with them before, having collected plants from an outdoor pond and putting them in my aquarium. The easiest way to deal with them is to carefully inspect all plants for the shelters that these caterpillars make. In other instances, I manually extract the caterpillar from its shelter and feed it to my fishes.

Damselfly nymphs start out really tiny, but still look like damselfly nymphs when they're just barely 1mm long.

[Y3H]

Ugh. Looks like I got a lot of work to do. Well at least moths doesn't sound as bad. Thanks!

EDIT: Are there any chemicals/medication to use to nuke the tank in case the invasion gets out of control? I do not feel like ripping apart my newly scaped tank