Hi Yoshimitsu! A very Warm Welcome to MASA! And thanks for starting a new thread and introducing yourself.
I am glad that you have come to us before you start your marine experience/journey.
Please have a look around, and ask as many questions as possible. It is FAR better to start your marine set-up armed with the correct knowledge, than having to make a costly mistake!
So, do you have something in mind already? Do you have an existing f/water tank that you want to convert? Or are you thinking of purchasing a tank specifically for the marines?
Also, what size tank are you looking at? And what are you planning to keep?
Many thanks again and don't be shy or don't be a stranger now, you hear!