Sounds like a nice little setup !

A: 1. You said you have the lighting, and Co2 What are you waiting for ?

A: 2. Given that your setup is DIY yeast reactor Co2, and the depth of your tank your lighting sounds a bit high ? I would go for 2 to 2.5 WPG. I am also partial to PC lights so I'm afraid I am the wrong guy to ask about converting your lighting. Personally I would go with a higher spectrum, but I don't believe it's critical.

While you appear to be off to a Blazing start I would anticipate your Co2 production to start running short. This is the inevitable cycle with yeast production. Tanked Co2 is more constant or stable.

Your lighting sounds adequate if not high. If you sincerely want to invest in the system I would consider a decent substrate like ADA Aqua soil or Seachem Flourite or Onyx. You might also consider investing in tanked Co2 ?

People always seem to jump on the concept of HO lighting, but have to be coaxed and prodded into Co2. WTH ???

Historically the shortfall has always come down to Co2, Nutrients, and Lighting in that specific order. I humbley suggest that your system will probably follow suit.

Last but certainly not least I would repeat that Substrate is "Always" a key component to Plant cultivation of any type. While I firmly believe in water column nutrients the plants evolved with Roots ! and you cannot overlook that and expect successful results. HTH Prof M

P.S. Do have a look at Tom's little Co2 reactor. For a system such as your own It's Da Bomb ! ;^)