Help Saltwater stocking issue 10 points?

I am going to skip tank specs for the sake of tie and reply with 'its totally fine, I checked at two different stores they both agreed it is fish ready". Thats not a lie btw. Okay my current stocking in my 29 gallon saltwater biocube is; 1 turbo snail, 1 sand sifter snail, 1 purple spotted reef lobster, 1 coral banded shrimp, and one Snowflake Eel (8in long). the tank is three weeks old and cycled. I am going to fish store soon and need to know if I can add a clownfish or two. The Snowflake eel just sits in his cave all day long and makes my tank feel empty. I want to add a Clownfish or something bright, cool to look at, interactive with tank, or cool. Any suggestions as to what I can add? I am using all stock equpment on the biocube except for my heater. It is 1.5 in thick sand and has 1 large 15 lb piece of liverock in the middle of it and 1 smaller stone like piece that is stacked on the side of the tank its like a rock you could find outside between 2 and 5 lb... My eel is happy in his dark secluded cave after kicking my lobster out and tearing off his claw ( I know, I am a jack for putting them together go call PETA I take better care of my eel than people do of there cats and dogs to make him happy and it was an "unforseen complication" or in otherwords, I brainfarted at the store with the compatability thoughts and forgot about him) he will regrow it though as he is only 1 in long and a little baby. So, what can I add to this tank? I must add I am upgrading to a 55, or 75 gallon tank in December so it can be a big fish that grows really slow. Please help guys tommorow is the last day the do the fish orders and need the orders of fish for the next month! Even if you have no clue, any helpful info would be appreciated. Spare me the comments about animal cruelty with the lobster I love my animals and take good care of them he will be fine and is now in a new cave that only he can fit in, this happens to thousands of those things in the oceans everyday, and he will regrow his claw. the fight was territorial only. thanks alot people! plz help