At my local petstore, there as a buch of small plants cluttering the top of the tanks. The employee was eager to give me all the plants for free (he called it a pest) and called them duckweed. Should i put it in the tank?
I don't see why not. For some reason, duckweed is "controversial." It will outcompete other floating plants and can prevent light from hitting your lower-level plants so that could be a reason not to have it. It grows fast. It keeps your nitrates down. Some fish like to eat it. It provides good cover for surface dwelling fish and fish that like subdued lighting.
Depending on what you want it could be a good choice, and then it could simply be a mess. For HOB filters, it really can be a pain in the neck as it can clog intakes and simply won't stay in place. It will grow like a weed and one piece can become a hundred in a short time. If you don't have high light plants it could be a good thing to have it. Any plants that need higher light and lots of nutrients could suffer from the light that is blocked and lack of nutritents.
Getting rid of it once you have it can be really hard if you have a lot of surface movement thatmight get the little plantlets caught on other plants. You think it is gone and then a months later it is back.
My pearl gouramis eat it. I actually like it so I grow it in a jar by my window and add it to the tank once a month or so. If I didnt add it it would not survive in my big tank.
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