I've had a new 20 gallon fish tank for about 2 weeks now. We waited a couple of days and got the filter and the heater up and running. Then we added fish.
We have 1 Hi Finned Bull Shark (Columbian shark?), 2 black Mollys, 3 neon tetras, 2 high finned tetras, one red eyed tetra, 1 peppered...