Will 2 (two) GSP coexist comfortably, and thrive for life in a 55g..(full marine). I assume if they will in a 55g (friends tank) then 2 would do the same in my 210g (full marine)...any coments welcome....My friend who got into fish just because of the GSP has been looking for one for a while (2 fish stores in about 100 miles radius other than wally world 1 is upper level good and one is lets say i wont give them a penny of my money), and since iam going to kansas this weekend and they have a pretty good fish store that i frequent every time i go to kansas and they NORMALLY have GSP in the brackish section(not fresh water section) iam going to pick up a couple of them for her..yes i have experience with GSP and know what to look for when purchasing one iam just curious as if 2 will get along ina 55g as a general rule considering each fish is its own and all have diffrent attitudes as individals..she would like to have 2 if they will be happy for life in a 55g together