I have only fed market shrimp to my bichirs and I just shell them and chop them up into bite size morsels and drop them in the tank and the bichirs take care of the rest. Just make sure you don't overfeed when using market shrimp, it will cause ammonia spikes in no time if left in the tank to rot.
i feed meat daily i have feed them liver but it clouds the tank real bad i suggest beefheart and tilapia the BH will get them big and fat all my polys eat them both i jus cut semi froven meat n2 strips small enuff 4 them 2 eat and refreeze it laying flat not touching or grouped n meals no cooking needed lots of $ saved but u will do alot of cuting lol oh yea shrimp 2 mine dont really like it tho