dude. im planning on getting a 200-300 gal tank like right before x mas... so in my 55 right now i have.
1 5 inch or so tin foil
2 5-6 inch paroons
1 3 inch id shark
1 5-6 inch pleco
there is TONS of room in my 55 and thats why im planning now.. my sharks have tons of room to swim and enjoy life. ( altough they tend to stay in the corner

)
but i wanna get them ( sharks ) into the 200-300 tank soon so they can have tons of room to swim.. also instead of all black fish i wanted to toss in a couple pictus, columbians to add some colour i have been reading and the columbian, pictus, and ID's dont grow over a foot so a tank that is 2 feet wide should be plenty! ( for now )
once i buy a house ( 1-2 yr ) i wanna build a 5000 gallon to house these. but for now my parents wont let me build that tank so a 200-300 is what i get.
BACK TO MY MAIN QUESTION....
do i HAVE to make my water brackish for the columbians like 90% of the webistes i find say... and if so can/will my other sharks live in that?
thanks guys for the help