What are you using for an LED grow light? I found mine were getting really leggy too under one of these: https://www.amazon.com/UNIFUN-Growing-Hydroponic-Aquatic-Indoor/dp/B01F53LP46/ref=sr_1_6?s=lawn-garden&ie=UTF8&qid=1520821786&sr=1-6&keywords=grow+light
It was my first time trying it last year, but I may have been trying to cover too much area, or had it a little to high above the plants.
Yescom 225 Blue Red Orange White LEDs Grow Light Panel Hydroponics Ultrathin Plant Lamp
I think I had my lamp too high up, so I lowered it this year. I won't be able to lower it for my other grow containers that I planned.