anything special i have to do??...i have about a dozen or so and some have become 3 times bigger then when i bought them last month...do they always grow this fast???...and they also seem to have alot of new growth with many smaller starting to grow out...some have reached the top of the water already and are just floating up top from how big they have gotten...so just clip them and im ok??...i still cant believe its grown more then 6 inches in a month....thanks