Is it really hard keeping slings??

[Trenor]

I feed my Ts dubias with crushed heads mainly for convince. It moves but usually doesn't roam much. This lets me monitor who is eating and who isn't more easily. It helps with removal in the event the T doesn't eat. I prefer not to have to chase uneaten prey around the enclosure. It allows me to offer a larger prey item than I would if it was alive.

In the wild, they will scavenge dead prey left uneaten by something else like most insects will so to me it isn't much of an issue.