I have had direct experience with this.... If you only have 5 plants then take the one with bananas out and grow the rest out. The REAL issue is to figure out WHY you got the bananas in the first place. Trust me if it happened once and you just hope it won't again it WILL!!! Usually it is a light leak or heat.... I would go with light leak as that seems to be the most common...... Let me know how you make and know I feel your pain... I went through 2 full grows before I got it right.... The good news is, now that I have fixed the issue I am growing some serious good smoke. Got 5 oz's off a 3ft high plant.. What I am trying to say is there is hope and it is a HUGE learning curve this growing thing.... People think you can just toss some seeds in the dirt and hook up and light and you are good to go...boy O boy are the wrong!! Good luck and let me know how you make out!
Cheers!
C