Will These Pop My Cherry's Eggs?

[Syphoniera]

Think I've finally found the actual right place for this, and hope some nice, helpful expert will know...

I finally acquired my first cherry shrimp a bit under a couple of months ago, with a little duckweed floating on top in the bag - evidently occupied by mobile life forms - and they all went into a little planted 5 gal. I'd put together some time earlier out of cuttings.

Anyway, noticed something looking like a little white planarian-type worm but suspended from the duckweed by a thread - got that syphoned out and actually forgot about the thing.

The one adult female of my 6 had promptly become both berried and saddled - but a little later, as I noticed more of these dangly things, I also noticed her, perched in a Wisteria 'tree', apparently digging out a string of eggs, with only a few remaining, and later I couldn't see any, or any 'flapping' occurring, although she was extensively saddled still.

I've been so looking forward to babies..

I know the usual planaria are toxic to shrimp and can attack eggs - or even, heaven forfend, females with eggs - and I'm assuming that's likely what happened there, but are these thread-producing things actual planaria?
Anybody encountered or heard of these before?
I don't seem to be able to find the right search terms, and I've never heard of flatworms using threads...

I've removed some fairly heavy multi-thread 'railways' from the duckweed to the Wisteria below, out of desperation tried the addition of one drop daily of Quick Cure over the most 'dangly' areas where shrimp didn't seem to be directly under, in case that did any good, haven't seen any sizeable ones or heavy threading for a while - and if they do eat left-over food they're out of luck as not a speck remains - I'm also feeding pond-type snails which prefer shrimp food to the hard-as-cement green-spot and brush algae which seems to have also arrived with the duckweed, now mostly removed.
But I can see tiny things hanging off the plants and sometimes moving on the glass.
And I never see them on the slate on which I feed.

Anyway, the female is once again loaded with eggs.

I'd considered taking out the shrimp into the q tank, ditching my pretty but infested plants for new cuttings, (or could I kill these things with a copper treatment? and soak the thereby salvaged plants a few days in Ultimate water conditioner, which removes copper??? or prob. too risky? And prob. still brush algae.) sterilizing the tank, and setting it up as a Walstad, (soil-based, gravel-capped natural planted method, uses plant uptake rather than nitrifying bacteria as main bio filter - no 6-week cycling wait) but since A) I'd probably carry along the thready little monsters and B) shrimp aren't generally noted for hardiness in readjustment or tolerance of variation in water quality, which would alter in the unlighted, unplanted, uncycleable, bare q tank, I've been chicken.

They're just the liveliest little things and it took me a long time to find any - and, frankly, I'm attached to as well as responsible for them...

Does anyone know:
What these thread-hanging, planaria-like things are?
Whether they likely destroyed the eggs?
And pose a risk to my shrimp, either adults or any young which might potentially survive?
And of any way (I can dream) of killing them off without harming my shrimp?
And whether it would likely risk my shrimp more transferring them first to the bare, uncycleable q tank and from there (hopefully pest-free) to a Walstad within a period of weeks, than leaving them as is?
Or have some brilliant suggestion which would never have occurred to me in a billion years?
Or anything helpful?

I'd so much appreciate some knowledgeable help; my shrimp would certainly be very grateful.
It really is the little things in life which matter most...

 

[invader]

I don't have the answers to all of your questions, but I might have the answer to the first. I think they may be hydra, which can supposedly catch and eat fish fry, so I would assume the same thing may be happening to your shrimp.

Here's a picture to compare:

I'm afraid that's all I can help you with right now.

 

[Syphoniera]

Thanks, invader.

It's a good suggestion, but I think Hydra usually cling to glass and other surfaces, and tend to contract when disturbed and I don't think they suspend themselves from the top of the water or plants using spider-like threads, but, darn it, I don't know what does.

These little critters are white and wormlike and are closer to planaria that anything else I can think of.

And planaria do pose a danger to shrimp eggs and even female shrimp - but has anyone heard of a variety of planaria or anythng else travelling via webbing?

Bitten by radioactive spiders, like Spiderman, perhaps?

Because I'm not sure why else my female Cherry would dig out most of her eggs and later the rest, and I don't want her to lose the current batch she's carrying...

There's supposed to be an old Chinese curse, 'May you live in interesting times' and I think that's been applied to aquaria these days...

Does anyone have any ideas?