I have duckweed, amazon frogbit, and red root floater. So far the duckweed has multiplied a ton, majority of the frogbits have another plant growing on them, and the red root floater have increased in size greatly. The frogbit has the longest roots, but they don’t grow dense or consistent. The duckweed and red root floater both have very shoot roots. What’s the best way to encourage long, dense, consistent root growth?