I just recently aquired an African Brown Knife fish, and i Have it alone right now in a 20 gallon it is only about 5in long and i have tried putting feeder shrimp and feeder fish in the tank but it seems like he sin't showing much intrest in them....not really sure what else i should try feeding him i have frozen brine shrimp but i am pretty sure that will all just fall apart before i gets down to him on the bottom, or get stuck in all the plant cover i have in there for him.....any help would be appreciated thanks.