I researched the festivum, niether of them have that black stripe by their eye but they say that the male and fermal difference that one of them is dark and heavily barred and the other isnt but there is also a colour difference however that probably woldnt have generated yet, if it is a festivum then will it be ok keeping two in a 250L 120cm x 45cm x 46cm with 2 firemouths 1 rainbow shark 6 red eye congo tetras and 3 silver dollars? (YAAY M1 and M2 (blue rams) have finally paired off!)