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I have a strange vining plant growing in a couple of my tanks, tangled in what I think is Didiplis diandra. It pulls out fairly easily, but I could see how it could easily get out of hand. It is the worst in a new tank, set up one month, Excel from day one. What is this, and how worried should I be? It really reminds me of dodder. I used to do landscape design and maintenance, and I had three separate outbreaks of dodder, in three different times and places... it is like the s#%@ is haunting me. Here are my specs:

20L, 48 watts of T5 suspended 2" above.
DIY CO2, not working well.
Regular dosing of Excel, 2 mil Flourish twice a week.
Tank seems to have cycled, no ammonia/nitrites/nitrates ever.

Hopefully here is a picture after I pulled it out (my first try at uploading...)
 

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That is Utricularia gibba and it can be a pain to remove from your tank if you let it go but it can be removed manually. I've never tried using any other means to remove it.
 

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Oh yeah, Utricularia gibba is a total pain. Manual removal is the way to go and try not to miss any little pieces that break off. I've managed to get it out of one tank (at least I haven't seen the darn thing in 3 months) and I'm still fighting to get a last defiant bit out of a large moss mass in another tank. If you keep an eye out for it and remove it whenever you see it you should be able to get rid of it.
 

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I have this in my 1.5 gal betta tank. Its been growing in my Indica. I pull as much out as I can find with my tweezers. That seems to be stopping it, cuz at the end of the week I find only 1 or 2 strands and its taking longer for it to grow. Thankfully I haven't seen it in any other tank.

In response to whats a weed, a weed is something that you wouldn't pay money for, whether it be a rose bush or thistle.
 
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