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Hi I have a divided betta tank, it is a 5 gallon with two adult male bettas. I just happened to notice that the one the left side is a bit lazy :/ He seems comfy but he always stays by the divider and by the heater(the heater is on his side of the tank). I was wondering if this may be a sign of an illness?

What size is your tank? 5gal
What temperature is your tank? 74-76 degrees
Does your tank have a filter? Yes
Does your tank have an air stone or other type of aeration? No
Is your tank heated? Yes
What tank mates does your betta fish live with? 2 bettas in a divided tank.

What type of food do you feed your betta fish? Tetra Betta floating mini pellets
How often do you feed your betta fish? 3 times a day, 2 per time.


How often do you perform a water change? 2 times a week
What percentage of the water do you change when you perform a water change? 50%
What type of additives do you add to the water when you perform a water change? BettaSafe

Water Parameters:
Have you tested your water? If so, what are the following parameters? No I haven't.


Symptoms and Treatment
How has your betta fish's appearance changed? None whatsoever
How has your betta fish's behavior changed? Has been lazy lately.
When did you start noticing the symptoms? A few weeks ago
Have you started treating your fish? If so, how? No
Does your fish have any history of being ill? No
How old is your fish (approximately)? I have no idea
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