Hello again Pravi1110, Im glad to see that you got a bigger tank for him. A 75 gallon will be good for him for the rest of his life. You could upgrade to a bigger tank in the next few years but its not necessary. One suggestion I will make at this time is in reference to your heater. Make sure you have water moving across the heater from either a filter pushing water past it or from an air pump with an air stone below it. If you not have water circulating past your heater your tank could end up having warm and cold spots. You want your water to have a consistent temperature through out the whole tank. And as always do your weekly water changes and keep your filters in good working order.