Hello, so I recently changed from a 5-gallon tank to a 20-gallon tank and bought 4 small green barbs. They have been with me for about three days and so far I always see them together swimming at the surface of the tank and rarely swim at the bottom. I try searching in google to see what's causing them to not swim at the bottom and always at the surface and results show that either lack of oxygen or PH level is too high for the smaller barbs. I have 2 filters - ( Aqueon QuietFlow LED PRO Aquarium Power Filter and a small filter that came with my 5-gallon tank kit ) so I am not sure if its lack of oxygen that's missing? Any help from anyone will be great! thank you very much!
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