Im down to 4 mono's since they have been in the 120. A hungry ornate got one the second night and one died when I went to catch them all and put them back in the 55. But they were waaaaay to hard to catch and one just all of a sudden gave up and went limp.....had a heart attach or something? But he was fine for a bit but now he is gone. Measured him at 5'' and his gills were clean(so no parasites)....tank params...ammonio 0, nit, 0, ph 7.6, temp 86. The other 4 are doing great. I did a w/c and all is good as of now.