Upside Down Catfish won't eat

[FrozenFins]

I've had these upside down catfish for almost a week. In my experiance fish will skip out in the first few meals (one or two). But thesee upside down catfish, havent been coming out for food. I started feeding them when the lights were out, and still no luck. How do I get these guys to eat? Do they take awhile to get adjusted to their new home?

Thanks for any help!

[Colu]

Have you got some floating plants in tank  to give them cover try them on blood worms 

[The nano tank man]

Try givibg more cover and places and they might come out. Also try other foods.

[FrozenFins]

34 minutes ago, Colu said:

Have you got some floating plants in tank  to give them cover try them on blood worms 

No, all though I do have some amazon frogbit in another aquarium, I'll give that a try.