Does anyone know the approximate cost for fishtanks in Thailand/Chiang Mai?

I would like a 6 foot long tank, with a ''fairly'' nice stand (not just an open metal stand) for my living room.

Any idea about how much these go for, ballpark, usually?

If you go to the large Aquarium shop in the flower market by Tesco on the Super Highway,you will find many...all sizes and complete with stands,some very nice wooden cabinets. I saw a couple of complete aquariums with 'furniture' quality stands around 20,000 baht....they have a good selection of fish and aquatic plants. I believe they can 'custom' make to your design.