Having had my 180L tank cycled for 3 months now and re introduced my female bronze cory plus five more to keep her company, also three swordtails, I plan to introduce a pair of Blue Acara's to hopefully breed, and that will be all in this tank except I would however like to have a plec no bigger than 4"-6", PH is 7.6, 18dKH hardness and temp 25C, I have done some searching and come up with this choice.. Prince Tiger (L377 LDA18) Leopard Frog (L134) and the Common Bristlenose, also is it fair to keep one on it's own or would 2 be better, All comments welcome good or bad, Thanks