Get a net. The canals in south Florida are teeming with exotic cichlids, plecos, and other released aquarium fishes. The less-impacted areas have many beautiful native fishes. If I were you I would set up a sand-bottomed planted tank with native schoolers such as:
KILLIFISH
Fundulus chrysotus- Golden Topminnow F. rubrifrons- Redfaced Topminnow Lucania goodei- Bluefin Killifish L. parva- Rainwater Killifish
There are many fish an inexperienced person could keep in a 100. Tiger Barbs are very hard and active. The go well with Serpae Tetras and BlackSkirt Tetras.
For cichlids, almost any CA/SA would work with a few exceptions. If you wanted to do Oscars -- You just need to keep the tank clean, aggressive water changes, and good quality food (Such as Hikari Cichlid Gold or similar). If you start with a juvenile with some convicts you will have an active tank and a fish that you will have for many many years.(10 or more years).