Betta fish swimming happily in a new Deco O mini fish tank

Antique Vintage Art Deco Fish Bowl Fishbowl Fish Tank Aquarium With Stand
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The Deco tank is NOT a bowl! Only the plastic boards around the aquarium are round, but the cellophane sides are in straight and flat glass, and wont make your Betta get any problems with swim-bladder, so thats good! Never ever use a bowl or vase for a fish. The bended glass make them loose their balance and get swim-bladder! Thats really important.
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Have you tested your water quality? But, I do agree that it is most likely the new object that you added. Do you still have any living fish in your tank? I think you are on the right path and agree with removing the decoration. I would treat your tank like it is new again. Add new fish slowly and in small numbers. Keep an eye on your nitrogen levels. If there is any toxins still in the tank from the decoration it should disparate with time and water changes. Image Detail for - ViNtAgE FISH DRUM TANK AQUARIUM ART DECO cast iron bowl stand ANTIQUE ...
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Photo provided by FlickrAntique Cast Iron Art Deco Fish Tank Stand Verona Glass Plant Flower Terrarium
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Deco Hexo Hexagon Fish Tank Silver £64.99 Quantity FRF-HEX/S Silver HEX TANK Product Name: Deco Hex Description: Deco Hexagonal fish tank Designer aquarium Magic touch lighting feature for home, office and shops. Made by clear glass Magic touch lighting feature Advance lighting with High Power LED: Sun-like Shimmering Ripples creates a very relaxing environment Blue LED’s create Moonlight Effects at night Built-in filtration unit is hidden in tank décorDeco O Mini Round Aquarium 10 Litre White £49.99 Quantity Product Name: Deco O Mini Description: Deco O Mini round fish tank white Designer aquarium Magic touch lighting feature for home, office and shops Made by clear glass Magic touch lighting feature Advance lighting with High Power LED: Sun-like Shimmering Ripples creates a very relaxing environment Blue LED’s create Moonlight Effects at night Built-in filtration unit is hidden in tank décorDeco Hexo Hexagon Fish Tank Black £64.99 Quantity Product Name: Deco Hex Description: Deco Hexagonal fish tank 15 litre. Designer aquarium Magic touch lighting feature for home, office and shops Made by clear glass Magic touch lighting feature Advance lighting with High Power LED: Sun-like Shimmering Ripples creates a very relaxing environment Blue LED’s create Moonlight Effects at night Built-in filtration unit is hidden in tank décor.Deco Hexo Hexagon Fish Tank Black £64.99 Quantity Product Name: Deco Hex Description: Deco Hexagonal fish tank 15 litre. Designer aquarium Magic touch lighting feature for home, office and shops Made by clear glass Magic touch lighting feature Advance lighting with High Power LED: Sun-like Shimmering Ripples creates a very relaxing environment Blue LED’s create Moonlight Effects at night Built-in filtration unit is hidden in tank décor.Deco O Mini Round Aquarium 10 Litre Black Product Name: Deco O Mini Description: Deco O Mini round fish tank black Designer aquarium Magic touch lighting feature for home, office and shops Made by clear glass Magic touch lighting feature Advance lighting with High Power LED: Sun-like Shimmering Ripples creates a very relaxing environment Blue LED’s create Moonlight Effects at night Built-in filtration unit is hidden in tank décorCompared to other aquarium filter- the Deco Os filter is placed at the bottom of the tank and you can easily place the air hose in small hooks along the side and then out through the lid to an airpump outside the tank. The water goes in at the bottom of the filter, and then it goes out in the top of it, in shape as bubbles. You can decide how much bubbles you want in the tank. Bettas likes bubbles, but they dont like when the water-stream is too strong, so you may use a small stream of bubbles in this tank. With the aquarium you will get the filter, filter-shelter, airhose, airpump, LED-lamp, a green fakeplant, 5 white decorationstones and gravel. You only need the fish and water!