The measurements for a MBU should say 26 inches +. I am not sure about a MBU reaching 36 inches. However, I feel that the 36 inch measurement probably includes some of the caudal fin.
That being said, either way 26 or 36. Your tank is too small. In a tank that size your are risking deforming the caudal fin, a common occurrence for MBUs in too small tanks.
I must ask, why do you not want to upgrade to a bigger tank? And why do you not want to provide a separate brackish tank for the GSP?
I would think setting up a bigger tank for the MBU and learning to create a brackish tank would be exciting and would show off you skills and commitment to fish keeping.
I can understand not having room for 1,000 gallons, but why not at least go with a tank size in which the MBUs caudal fin would not become deformed. Could you not go up at least to 300-400?
That being said, either way 26 or 36. Your tank is too small. In a tank that size your are risking deforming the caudal fin, a common occurrence for MBUs in too small tanks.
I must ask, why do you not want to upgrade to a bigger tank? And why do you not want to provide a separate brackish tank for the GSP?
I would think setting up a bigger tank for the MBU and learning to create a brackish tank would be exciting and would show off you skills and commitment to fish keeping.
I can understand not having room for 1,000 gallons, but why not at least go with a tank size in which the MBUs caudal fin would not become deformed. Could you not go up at least to 300-400?