Nice tank. The geos are pretty slow growers, but if you grow them out you will be rewarded. With 9 you should definitely get at least a pair
Honestly just look up southern delight and look at their ingredients and compare. Especially the veggie krill algae bits. I don't know what could be better than southern delight. I've had amazing results with it. I use the power feed and veggie krill and pre soak the pellets for about 15 minutes and then break them up a little in the tank so the fish can eat them up better. They're a little big for smaller fish but pre soaking works just fine until they're big enough to eat the pellets whole. Veggie krill would be ideal for winemilleri.