The Cichlid thing you have there is a Kribensis aka 'Krib'
as for the other one I think the shelldweller is NeoLamp. Multifaciatus might just be a L. though still learning my shelldwellers before buying some.
that aint no krib.thats a cockatoo cichlid.they are good for community tanks usually.dont know a whole lot on shellies but ive heard they should be kept in groups
Shelldwellers do fine in community tanks and this was the only one they had, but might keep a lookout for some more He doesn't spend any time in his shell though