My aunt is giving me a 2ft tank (2x1x1.5) I will be hooking up my external filter to it (thats good for a 3ft tank I used it in my 4ft). My plan is to have one plec (probably bulldog or bn), a load of green plants (mixture of real and fake) a long air stone and tetras. How many tetras could it comfortably have? Obv I will only add them 3/4 at a time and should I add the plec before or after the tetras? I still have all my water testing stuff too.