Due to having a spare 20 gallon tank I don't plan on stocking with coral, I was thinking of dedicating it to either a species tank for a frogfish or making a deep sand bed for garden eels which I think we all agree are really cool. I know frogfish usually don't live more than a year or so in captivity (or so I've heard) and the really ornate ones are pricey (around the equivalent of $100 here) so I worry about the risk something happening to him. The garden eels on the other hand, I'm unsure of what they eat and how difficult they are to maintain (I would have a deep sand bed if I went this route). Also can most other fish be kept with garden eels? Which do you guys think is the better choice?