I am looking for the appropriate fish for my nanocube 12, and I am well aware of the 1" per 5 gallons but can this be pushed a bit? I am looking for a true percula clownfish, a yellow clown goby (only 1"-1 1/2"), and a neon blue goby (or any small cleaner goby). Of course I will also be stocking the nanocube with a fire shrimp, a hermit crab and maybe a small sea star. I know this is probably over the limit and if so which fish should I not buy?