I used to live up there for 6 years. The only pet store up there (at the time, I believe there is a dog/cat food/grooming store up there now) was overpriced to say the least. And you know what? That's perfectly okay! I understand rent is high and the cost of staff is also, but both the management and staff in there were absolutely horrendous. The manager/owner was the most rude person in the store if you can believe it.
Yes, you have a huge market for a store up there. Especially if you have even a small idea about what customer service is. The customer isn't always right, but when they are wrong there's no need to tell them what an idiot they are! LOL
BTW There was at one time a lady who opened up a fish store out of her house in Thickwood or Timberlea. She didn't do too well and closed down less than a year after she opened. I can't remember the name of her store at the moment, sorry.