This is one of the two places I can recommend in the Tri-cities. The other one I already posted about. This place is great, everytime I'm in there I end up buying something, whether I intend it or not.
The salt water selection exists, but is severly lacking right now (although Anthony said it will be stocked in the next month or so). The fresh water selection varies over time. Last time I was there the selection was predominantely African Cichlids, although on occasion they have Discus. The selection and quality of fish increases greatly during the winter months, largely because they focus on Koi ponds during summer.
The employees are very enthusiastic about the hobby to say the least, and they always have great stories about their experiences.
I would give this place 4 out of 5 stars.
The address is 824 Tittabawassee Rd, Saginaw