Actually there's a dozen dwarf gouramis in there, 6 males and 6 females and also 6 Otos. If there are any problems with the Gourami's, I have another 75g I can move half of the males into.
One of the males has already built a bubble nest and is a bit aggressive towards the others when they get near his territory but that is it so far.
Here's a few pics of the male gouramis
Not the best quality pics, but I only have a camcorder to take pics. I've tried to get a few pics of the grains size difference in the Eco Complete, Soilmaster, and 3M sand but they don't come out too well. I will see about borrowing a cam and getting a better pic over the weekend.