I'd spend $ on removing some underweight LMB, adding cover, then BG. Give them some place to hide. I doubt that the FHM would last a week.

Plus optimal food for the LMB is 1/4 to 1/3 their body length.

18" LMB eating a FHM would be like you or me eating rice one grain at a time. Lots of effort for little food.

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).