You are right about 2/3 water 1/3 land. What you could do is get a divider to keep land and water seperate, and then heavily plant the water section with java fern, anubias etc. you may also be able to put a few plants on the land bit as well. Also a 10 gal is very small for 6 FBTs, but the 55 gal wiuld be great for them. Keep us pisted on your progress