Duck Weed

What's the minimum tank size for a mallard? Could you go with one of the smaller ducks if your tank is small? What fish would then eat the duck poo?

The rule is 1 gallon per inch of duck, so you'd probably need a 20 gal for a mallard; a teal or bufflehead might work in a 10 gal. For duck poo clean-up, I'd use round gobies. They'll breed in the tank, but you can just dump the young in the nearest waterway.

I have heard that ducks will only grow to the size of the tank.

Yeah, but you'll have a rectangular duck....

I haven't gotten around to trying it myself, but I hear 3% H2O2 will kill duckweed when dosed at 2.5mL per gallon of tank water. Some folks are have good luck with H2O2 as an algaecide. Other plants, inverts, and fish fry may also be affected.

Or an afro pick. That idea is awesome.

I can tell you from first hand experience that it won't. Wish it did.

I haven't gotten around to trying it myself, but I hear 3% H2O2 will kill duckweed when dosed at 2.5mL per gallon of tank water. Some folks are have good luck with H2O2 as an algaecide. Other plants, inverts, and fish fry may also be affected.

Or an afro pick. That idea is awesome.

I have heard that ducks will only grow to the size of the tank.

I personally keep giant duckweed in my tank, when it covers the surface i just pull a couple scoops of it out, sometimes with a net, sometimes just by hand. Its a native, yet invasive, yet nonetheless native plant. In my native tank, it is one of the few native plants I have... Is Myriophyllum Pinnatum native? Anyhoo. If anyone wants some duckweed, I'll send you some.

I have a mixture of frogbit, watersprite, and salvinia that have mostly outcompeted the duckweed and I have very little of it left. It coats the top of the tank quickly but is a lot easier to remove/control. I recently made the mistake of adding Azolla to the tank, and while more attractive from above, its growing habits and difficulty of harvest are much like that of duckweed. I don't know if any of that would help with your fry though.

Myriophyllum pinnatum is native. However, it is easily confused with M. spicatum and M. aquaticum, which are both exotic.

I personally keep giant duckweed in my tank, when it covers the surface i just pull a couple scoops of it out, sometimes with a net, sometimes just by hand. Its a native, yet invasive, yet nonetheless native plant. In my native tank, it is one of the few native plants I have... Is Myriophyllum Pinnatum native? Anyhoo. If anyone wants some duckweed, I'll send you some.