Any plans for critters? You have so much flexibility with a 40 breeder! I would absolutely add some amano shrimp, should it tickle your fancy. Also, some really tight schoolers for the top 1/3 and maybe a cool bottom dweller (sids or y. cruciatus are my two current favorites). man oh man, the possibilites! Hope you get the co2, that tank will be banging in no time!!