your 55 could do this if you wanna go all out fun and cash.
1x Senegal Bichir (pay 5 for a reg at petsmart, pay $30 for an albino. Albinos are worth it)
2-3x Peacock eel ($20-$25 for the both of em about, maybe 37 for 3 tops)
5x Roseline Sharks (A whoping $30 a piece, but they get to 6 inches. Nice colourful fish)
1x African Brown Knife Fish
Then the rest is up to you pretty much. I'd heavily plant it, and in the final stages, add in a single angel, or a pair, depending. But It looks like a smooth tank. Sand Substrate would be a must because of the eels. I hope some of those might help!