Honestly hydro is a jump into the deep end for a new grower, there's alot of variables to take into consideration, ph of the water, your PPM for your solution, temp of the solution in relation to the environment, environmental temp and Humidity timers to keep everything on cycle the list is pretty long and I myself wouldn't recommend jumping in the deep end right away, also I would be guessing and throwing a dart at dart board to diagnose the issue your having with this little one for the same reason, I don't know all the variables..My suggestion would be start a new seed or transplant this one and I would suggest a living soil organic ammendment grow in fiber pots for a for a first timer which is very very user friendly and brings down alot of the variables for growing because the soil and plants do alot of the work themselves, normally you just need to maintain a good climate temp and humidity and PH the water your using and add a few ammendments to tops of the pots a couple 3 times every 4 weeks the rest is pretty smooth sailing...Good luck and I hope this works out for ya, always nice to see new growers taking up the hobby