Same here, tip top of the reef under LEDs. Grows so fast it's problematic at times. It's all good, great starter frags for new folks in our club or sometimes a good option for Paying it Forward and just giving them away. Our club did a growout comp with it last year, Here's how mine did over 4 months.
Fresh cut, in the tank a few hours. (Nov)
1 Month - (Dec)
Same month under the blues
2 Months - (Jan) Starting to get some good growth
3 Months - (Feb) Crappy picture, short month and I was in a hurry
4 Months - (Mar) It's officialy a weed now