This has worked better than expected. I tried cutting the bigger GSF with shears - too much work - so I either compost or eat the bigger trapped GSF. I put the small ones in gallon freezer bags with the weight of one half of the daily pellet ration. At feeding time I throw out half the ration of pellets and the frozen chunk of GSF. They hit it like sharks on a whale carcass. Fun trapping the week's GSF on Saturday morning and I have halved my feed bill.