If you have to feed live, make sure you go through a QT regiment on your feeders.
When I used to feed live, I always have a 10 gallon tank running..I would put 100 -150 guppies in there, feed them, treat them with prazipro to get rid of any parasites. Out of 100, 20-30 may died within 3-4 weeks. After that time, I move them to 20 gallon which is their permanent death row ;( i feed 10-15 guppies per day).
I fill up the 10 gallon with 100-150 guppies again and th epriocess continues..by the time the death row tank is almost empty, the new batch will be QT'ed.
stan