Deep water culture bucket......problems (pics)

Hey guys so i got a drip planter from my local hydro shop. Its a self containing deep water culture system it has a submersible pump that sits at the bottom and it pumps the water up the tube onto the hydroton where my plant is the goes through the hydroton and the water ends up at the bottom of the bucket again.......now i change the water once a week right now and i give it its nutes and keep the ph right...now the other clones that i clipped at ther same time are a hell of alot bigger than the one in the hydro bucket i was wondering why it hasnt grown that much seeing as tho the one in the hydro bucket should be bigger than the ones in soil i was hoping you guy cold help me out and lemme know what im doing wrong....the set up never came with a air pump or an air stone could that be the problem??

dont worry i have pics hahaha



heres a pic of the other clone i took at the same time just to see how much bigger it is than the one in the hydro bucket

yes you need an air stone to give those roots air.. especially if the roots are big enough to the point that they are hanging in the water. Whats your water temp?

no there not near the water yet i dunno the water tem i need a thermometer
i add hot water to make sure the water is an even temp
nd right now im turning off the water for a little bit every day til i get an air pump is that a good idea?