Thinking of adding another fish any suggestion?

[naesco]

I agree with the suggestion of a goby for the bottom of the tank.
Review www.wetwebmedia.com to see your choices. Some like the yellow headed goby have poor survival rates.
Another choice is a small yellow goby or two (your tank is large enough for two). Just make sure he is not emaciated when you buy him. They need to be feed immediately when you add them.