I have a 15G IM Fusion AIO thats been up and running successfully for around 6 months. I havent added anything in probably 2 months. My nitrates are always really low, usually below 5. I currently have a Occy Clown, Tailspot Blenny, Court Jester Goby and 2 Sexy Shrimp. Would I be able to add one more fish? Was thinking a yellow clown goby. I know you dont typically want to have 2 similiar gobies but the CJG and clown goby being two completely different shapes, do you think I would be okay here?