The skunks like to live in small groups of their own, so it would be ideal to house 4-6 of them, but baer in mind adult size will be 4" when stocking. I'd also suggest to keep a good eye on the Red Fin
shark over time, as they grow older they can become quite territorial; so just watch the behavior between these two. For you bottom I'd then not add any more fish that pref the bottom region in this tank.
What behavior have you observed with the mix-cichlid group? They usually like more of their own too.
Now the only thing that worried me is the algae eaters. Not only do they grow to be 1ft long as adult, but they're also very territorial/ aggressive towards others. Unless you really really really lovvveee these fish to death and HAVE to HAVE them at all cost, I'd pers take these back to the store.
Its really a myth you need algae eaters in EVERY tank. A well maintained and balanced tank won't have issues with algae to start with, adding a aggressive fish to the tank stresses out the others so that's no benefit there neither and last but not least they add to your bio load for no apparent reason.