Will this work in a 60?
Dwarf lion (either fuzzy or zebra)
Maroon Clown
Valentini Puffer
Snowflake Eel
If I can fit a Niger trigger in there I would gladly replace either the clown or the puffer.
That sounds like a nice stock list! I would be careful with the snowflake because he might end up eating your clown. For the Niger..You could keep him for short term ( they are slow growers) but eventually would need a 150+