i got 3 festaes and getting a few more in a week or two. they are about 1-2" i want to raise a pair and establish a pair before i upgrade cause i have to save money to upgrade.i am limited on space right now so i can not get a 6' long tank . i can get a 4' or 5' max. i was thinking of getting a 170 gal. the dementions are 4'x2'x31" but its going to be a while till i can get that. so can i get a 75 for now till the pair gets about 10"+ then upgrade to the 170 when i have room?