Duckweed Invasion

I know some people like duckweed and actually go out and buy it. I think mine was a hitchhiker. It's basically taking over my community tank and although it's not really that bad, it's clogging my intake to my external filter and even got down into the impeller of the external filter. I have 10 tanks and I am finding that the duckweed is appearing in some of the other tanks too now.
I have a feeling there's nothing I can do about it, but thought it was worth posting a question just in case.
Is there any way to get rid of it without killing my other aquatic plants in my tank? I am trying to dip it out each time I feed the fish, but it seems to be propagating quicker than I can remove it.
Can't believe anyone would actually WANT that stuff. One LFS near me put it in their display tank. I used to battle it when I was living in Florida and had my outdoor ponds. Never thought I'd have to battle it here in England too!!
Anyone have any ideas?
Thanks

Oh dear, sorry to hear about your problem. I personally do not know of any way to get rid of it other than to physically remove it. I have some in one of my tanks. I also have hornwort in that tank and the competition for nutrients between the two plants seems to reduce its growth rate.

You can remove it with your bare hands or with a fish net, but duckweed is forever. However, it's not all bad. Because of its growth rate, it absorbs nutrients very quickly, which means it can remove the bad cooties from your aquarium. If you garden, duckweed is excellent in the compost heap, and you can even make duckweed soup for consumption by us humus beans. No kidding. Angela even posted a recipe.

It would not be so bad if it weren't for the fact that it's clogging up the intake on the filter and actually making it's way down into the external filter too! Darned stuff!

I had some in my pond a few years back (blasted ducks). I only found one way to get rid of it in the end. That was pyscially take out all spores of it. I had to wash and pick out every little bit and burn it straight away (big job in a 30ft pond) and touch wood never had it again. If you live in east anglia theirs lots of duckweed from all the water systems round here.

It seems like the pickup tube on an external filter would be well below the water surface and would not ingest duckweed. Those filters get rather pricey, so all of my aquariums have the outdated under gravel filters, which don't pick up fry or duckweed and work fine with proper aquarium maintenance. Sorry. Proper is an awful word and is highly improper for an improper person (me) to use.

And one more thing about duckweed. It will eat the nutrients that would otherwise feed algae. Imagine the aquatic version of Attack of the Killer Tomatoes.