Lims is tiny, and very dirty, and he doesn't have many fish... In fact... last time I was there it seemed like more of a hang out for old men than it did a fish store, haha.
Kings discus is OK, that's a few blocks east of lims on King street.
Fishaholics is small, but has some more niche-y stuff like shrimp and rarer plants (as well as planted tank stuff)
Midway tropical fish and pets in midway is a cool shop, nice people working there, and is always busy when I make deliveries to them.
Dennys pet store in kirkland is good, a little pricey, but have a great FW fish selection, and once in a while have cultured plants.
Pet-pourri in everett used to be good, but they recently cut their store in half, and it seems like they've been getting rid of more and more stock tanks. I was there on Saturday and it was a ghost town.
that's my rundown, hah