Iridescent shark with sailfin molly and black skirt tetra?

They will be fine together-they only get as big as the tank allows.If you want your shark to grow to be big he needs a 50-100 gallon tank.The iridescent sharks are not agressive and get along well with other fish.In fact they thrive among other fish and enjoy the company.Rosey barbs,oscars and angel fish are the most agressive fish in my experiance.