I have two dwarf lions (one zebra and one fuzzy) and coincidentally a Niger trigger as well. There is also a damsel that i acclimated the tank with and I recently added a lawn mower blenny and everyone gets along fine. I have been warned several times about potential incompatibility issues but for now nobody messes with anybody.
Depending on how big each fish are... I have my fuzzy dwarf in a smaller tank with a pair of clowns and they get along great, the lion would only come out at night tho.