Yes, I did the upgrade on my Biocube 29. I first gutted my hood and added 2, but trust em, it wasn't enough. I ordered a 3rd and soo glad I did. The 2 just wasn't enough for full coral growth. Once I did the upgrade, my corals blew up. Trust me, get 3! Removing the stock hodd was no big deal but I took the fans out and even with 3, I never did need fans again. Good luck and enjoy!
2 blue/white
1 blue/magenta, all with dimmers.