*Welcome to Reef2Reef @TRAPO !* Master Bruce has given you some excellent suggestions.I myself have a 20 gallon display were I house a pair of clowns and various other creatures.There are so many amazing possibilities.In regards to the pistols I really like them.I own a few myself so I would consider their landscaping behaviors.In a smaller aquarium you may not be able to keep corals on the sand bed.Once acclimated they have a tendency to bury things.Important things.
Thank you.
