Well... if you put it that way... I didn't think this setup was that big since I need at least 4000 Hot Coolant/s to get the LHE to produce SHS at max efficiency.
And I got my biomass from plain old carrots without much growth acceleration. If I want to get serious with Biogas, I would need to start breeding.
Also... nuclear is way cooler than Biogas.. I mean.. look at that:
I even put blue lights in there to emulate Cherenkov radiation :D. Please disregard the "natural ventilation" and the missing covers on the pipes.
Interesting point about nuclear reactors looking cooler than a biogas setup.
About the carrots: if you look at http://ftb.gamepedia.com/Crop_Breeding_…trialCraft_2%29 you'll notice that carrots have two minor disadvantages compared to pumpkins: 1. they're 1 tier higher, so they probably grow more slowly even at the same stats; 2. they require light level of at least 9 to grow, so you'd need to provide some artifical light sources such as glowstone or torches to allow them to grow at night. On the other hand, they have the advantage of macerating directly to bio chaff, instead of needing to be macerated twice.