Hydrotest Question

Hey all, to make it simple, I have no knowledge at all about hydroponics. I dropped a seed in my fishtank and now the leaves have come out.. They look huger and healthier than any of my soil grown.. the thing is, the leaves are underwater, but it seems to be doing fine.... do i have to get those leaves out of water so they can absorb oxygen? i have an air pump next to the small plant. and a light on. but now that the leaves came out, will it stop growing and die?

thanks

Die as far as I kmow. That's amazing it rooted under water maybe a new way to start. As far as I know it needs to come up untill the main rootball is out of the water . It needs air all the time and long roots can hang into the water all the time. Hope this helps.