yeah like stated a 75g is good for 1 O but def need a larger tank for 2 and a pleco, especially if it is a common pleco or sailfin, those things are poop machines and get huge, you should def save up for the 125g, keep your eyes out for deals on craigslist as you can always find great deals on there, i would never buy a tank new from the store anymore just for that reason (unless it was like some kind of custom order of course)