(Not Op in above post, forgot to change it, my bad)
•Polypterpus Senegalus: Also known as Dinosaur Eel and Dinosaur Bicher are my favorite fish. They are internally (and somewhat externally) built different than most other fish. This fish is built like most fish were in the dino days. Mine will swim up against the glass and follow my finger. They have poor eyesight but an AWESOME sense of smell. The two little appendages on the front of their mouth's are used for smelling. If anything new touches the tank water. It's likely that the Polypterpus Senegalus will be the first to know. These fish grown to be 12"-14" long. (Pic related)
I hope this list of fish helped.
From the sounds of it, you are new to the fish world and I would strongly suggest you research micro-ecosystems and water cycles. You need to know how the nitrate system works if you want to keep you fish happy.
Remember to always research a fish before you buy it. Find out it's diet, maximum size, water temp, and how it gets along with other fish. Even if someone tells you about a fish, research it yourself.
>>986499Though this statement is partially true, know that saltwater tanks are a BIG commitment. They are much more time consuming and expensive than freshwater tanks. (3 pieces of 1" coral will cost you 85 dollars. Coral is almost a necessity too.)
Get the freshwater tank first and see how interested you are. After several months, decide if you want to go to saltwater. If you do, i'd suggest getting a 90-125 gallon tank at least, you will upgrade to that eventually if you do saltwater.
Anyways, good luck with your fish, I hope I helped.