My opinion on stores
For plants I really like Animal Ark in Orem like mentioned above. I also work at Petsmart and will never buy plants there again. And I am limited on what fish I want to get there just because we've had the same ones forever and I get bored with them.
I really like Fish-4-U because the owner is ridiculously intelligent and knowledgeable about almost everything. That's where I went first when I got started with my first planted tank last year.
I haven't been to The Aquarium but I might be going today. I want to see what they know about plants and what they have.
Animal Ark in American Fork sucks! The employee's barely know anything.
I'm not into Salt Water yet but Aquatica and Reef Runners are pretty awesome. I love going in there just to look around. I also get moss from Aquatica and my Reverse Osmosis water for my tanks.
That's my opinion on stores here. I haven't ever visited others.