So I have duckweed in my tank now. I'm a little embarrassed to say that I didn't even realize that's what it was at first. I know where it came from. My own fault, really. I bought a couple of assassin snails from a shop and the tank they were in at the store was lousy with duckweed. I was a little hesitant at first but I decided to go through with the purchase. There was even a couple of pieces in the little plastic cup with a lid they put the snails in. I carefully removed it. I put the assassins in a jar to quarantine them. But clearly not for long enough.
It's more annoying than anything. It's not like it's going to harm the fish (unless I let it overrun the tank) and there's actually some benefit to it. I'm not about to buy a goldfish or dump herbicides into my tank. The only thing to do is an aggressive removal routine every day or two. Maybe I can get rid of it, maybe not. At this point, my expectation is to manage it. And I'll use dedicated equipment for this tank to hopefully avoid spreading. I'll do the water change for this tank on a different day too.
It's more annoying than anything. It's not like it's going to harm the fish (unless I let it overrun the tank) and there's actually some benefit to it. I'm not about to buy a goldfish or dump herbicides into my tank. The only thing to do is an aggressive removal routine every day or two. Maybe I can get rid of it, maybe not. At this point, my expectation is to manage it. And I'll use dedicated equipment for this tank to hopefully avoid spreading. I'll do the water change for this tank on a different day too.