Hydro pumpkins

[Exploding pumpkin]

Hello, I grow pumpkins every year... Atleast I trie. This year I was on YouTube a saw some people growing pumpkins on hydroponic systems. I figured I would try it. I had my plant in the system for about a week and showed no sign of stress when it was moved into the system. Yesterday the big 1st real leaf went limp and today the other two wen limp and now the whole plant is limp I pulled it out and it had very few roots. I put a new plant in with a lot of roots and was wondering if there is anything I can do to help this plant have the best survival. I did have one root type of fertilizer I put in the water. I had 20 gallons and it said 1 table spoon for each gallon but thought that was a lot so I put in 10 table spoons. If anyone has help at all it would be great.
Thanks