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A filter in a small tank is bad news. Bettas thrive in low to no current conditions and filters can catch their fins and damage them. the recommendation is 1 gallon of water per inch of fish, but my adult male thrives in a 1.7 gallon, so 1+ gallons is a safe rule period even though they should really be kept in the largest space possible. This space does not necessarily need to be an aquarium intended for bettas. You can get a really large vase from any store for low cost to keep him in as long as he is in no danger of jumping out and has plenty of surface air to breathe (betta actually have an organ called a labrynth they use to breathe air, much like a lung). He is probably very stressed out from all the attention and environmental changes. Some bettas are picky when it comes to food, and mine only agreed to eat pellets after I gave him frozen bloodworms and refused to taste anything else until I did so. Bettas are intelligent fish and need stimulating environments that include places they can hide in times of stress (such as being brought to a new home). You may want to try broad spectrum antibiotics just in case an actual illness is ailing him. Put him in a low traffic area so he can adjust to all the new changes, and be careful about water changes. He needs to be in conditioned water (the drops are only about 3 dollars) that is the right temperature, and the water needs a chance to build up healthy bacteria that break down waste. Changing the water to often will not only freak the fish the heck out, but will make your fish more prone to infection because there are no bacteria to help him out. Get rid of the light, it causes the water temperature to be uneven and will stress fishy out everywhere he swims, you can get a cheap bowl or tank heater for 5 to 0 dollars, just make sure to check the label to see what size of tank it is intended for so it does not cook the fish (sorry to be blunt). Mot importantly, give him space. You can observe him, but constantly adding or subtracting to or from the tank, unnecessary frequent water changes, and staring contests when he isn't used to you may actually kill him. give him some time :D
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