I moved to Bangkok in the last couple of years, I found this market as I still am astounded with the amount of fish there are here. So far, I have found every single specie of fish I have looked for, and many that I haven't looked for. I thought Chatuchak was missing out on gars but I found the ones I was looking for also here in the last month. I tried to find a Platinum Alligator Gar but they didn't have any today, but I believe I have found two Shortnose Gars. There are 100 stalls containing fish from simple goldfish, to exotic plecos, and even the most expensive arowanas. See for me, I don't go to my neighborhood fish store, I go to my neighborhood fish market. These are the more "common exotics" as the fellow user Thaigars said which I agree with, although the whole market has "common exotics" I will try to find some rare fish to post pictures of on this thread in the following month.
The pictures below are only some of the several species and store I walk past/visit:
The pictures below are only some of the several species and store I walk past/visit: